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Achnanthaceae Kützing, 1844

149190  (urn:lsid:marinespecies.org:taxname:149190)

accepted
Family
Genus Achnanthes Bory, 1822
  » Species Achnanthes aapajaervensis A.Cleve, 1934
  » Species Achnanthes acares M.H.Hohn & Hellerman, 1963
  » Species Achnanthes acus Simonsen ex F.Hinz et al., 2012
  » Species Achnanthes acuta Frenguelli, 1953
  » Species Achnanthes adamsii Cholnoky, 1964
  » Species Achnanthes adnata Bory, 1822
  » Species Achnanthes africana Woodhead & Tweed, 1958
  » Species Achnanthes agglutinata Grunow in Cleve & Grunow, 1880
  » Species Achnanthes ambigua S.J.C.Zimmermann, 1918
  » Species Achnanthes americana Cleve, 1893
  » Species Achnanthes amphicephala Hust., 1939
  » Species Achnanthes anceps A.Cleve, 1934
  » Species Achnanthes annulifera A.Cleve, 1953
  » Species Achnanthes antarctica Perag., 1921
  » Species Achnanthes antiqua Lauby, 1910 †
  » Species Achnanthes apiculata (Greville, 1859)
  » Species Achnanthes araucaniana Freng., 1934 †
  » Species Achnanthes arcuata (Lyngb.) Kütz., 1833
  » Species Achnanthes arenaria Amossé, 1941
  » Species Achnanthes arenicola J.W.Bailey, 1851
  » Species Achnanthes arguta Hust.ex Simonsen, 1987
  » Species Achnanthes armillaris (O.F.Müller) Guiry, 2019
  » Species Achnanthes astridii VanLand., 1967
  » Species Achnanthes asymbasia M.H.Hohn, 1966
  » Species Achnanthes asymetrica R.M.Patrick, 1936
  » Species Achnanthes atacamae Hust., 1927
  » Species Achnanthes athenais Pant., 1902 †
  » Species Achnanthes aubertii Hérib., 1920 †
  » Species Achnanthes australis Ehrenb., 1854
  » Species Achnanthes baccata (Leud.-Fortm.) Cleve, 1895
  » Species Achnanthes bacescui Bodeanu, 1976
  » Species Achnanthes bacillum Perag. in Héribaud et al., 1920
  » Species Achnanthes baicaliana Freng., 1953
  » Species Achnanthes baldjicki sensu Pantocsek, 1892 †
  » Species Achnanthes bavarica Ehrenb., 1853
  » Species Achnanthes bengalensis Grunow in Cleve & Grunow, 1880
  » Species Achnanthes bergianii A.Cleve, 1953
  » Species Achnanthes bergii A.Cleve, 1953
  » Species Achnanthes bernieri Manguin ex Kociolek & de Reviers, 1996
  » Species Achnanthes brevipes C.Agardh, 1824
    » Variety Achnanthes brevipes var. angustata (Greville) Cleve, 1895
    » Variety Achnanthes brevipes var. arctica (P. T. Cleve) T. Ko-Bayashi, 1965 represented as Achnanthidium arcticum Cleve, 1873
    » Variety Achnanthes brevipes var. capensis (Kützing) Grunow, 1867 represented as Achnanthes capensis var. capensis Kützing, 1844
    » Variety Achnanthes brevipes var. elliptica (Østrup) Cleve-Euler, 1953 represented as Achnanthes brevipes f. elliptica Østrup, 1897
    » Variety Achnanthes brevipes var. elliptica (Østrup) Cleve-Euler ex VanLandingham, 1967 represented as Achnanthes brevipes f. elliptica Østrup, 1897
    » Variety Achnanthes brevipes var. incurvata (Østrup) Østrup, 1897 represented as Achnanthes subsessilis var. incurvata Østrup, 1895
    » Variety Achnanthes brevipes var. indica (Brun) Cleve, 1895 represented as Achnanthes indica Brun, 1893
    » Variety Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 represented as Achnanthes intermedia Kützing, 1833
    » Variety Achnanthes brevipes var. leudugeri (Tempère & Brun in Brun & Tempère) Cleve, 1895 represented as Achnanthes leudugeri Tempère & Brun in Brun & Tempère, 1889
    » Variety Achnanthes brevipes var. parvula (Kützing) Cleve, 1895 represented as Achnanthes parvula Kützing, 1844
    » Variety Achnanthes brevipes var. pennaeformis (Greville) Cleve, 1895 represented as Achnanthes pennaeformis Greville, 1866
    » Variety Achnanthes brevipes var. seriata (Agardh) Cleve, 1895 represented as Achnanthes seriata C.Agardh, 1827
    » Variety Achnanthes brevipes var. subcrenulata (Cleve) Cleve, 1895 represented as Achnanthes subcrenulata Cleve, 1891
    » Variety Achnanthes brevipes var. subsessilis (Kützing) Frenguelli, 1930 represented as Achnanthes subsessilis var. subsessilis Kützing, 1833
    » Forma Achnanthes brevipes f. curtata Missuna, 1913 (1914) (uncertain, unassessed)
    » Forma Achnanthes brevipes f. elliptica Østrup, 1897 (uncertain, unassessed)
    » Forma Achnanthes brevipes f. gaussii Heiden in Heiden & Kolbe, 1928 (uncertain, unassessed)
    » Forma Achnanthes brevipes f. rostrata Karajeva, 1964 (uncertain, unassessed)
    » Forma Achnanthes brevipes f. trigona Østrup, 1910 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. bacillaris M. Peragallo, 1929 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. biareolata ‘Mereschkowsky' according to Proschkina-Lavrenko (uncertain, unassessed)
    » Variety Achnanthes brevipes var. brevipes Agardh, 1824 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. capensis Cleve, 1895 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. capensis ‘De Toni' according to M. Peragallo, 1897 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. clavata Missuna, 1914 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. constricta Cleve & Möller, 1878 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. constricta Grunow in Schneider, 1878 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. contracta Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. fragilariaeformis Lagerstedt, 1884 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. fragilariaeformis Kützing, 1833 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. japonica Skvortzow, 1932 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. japonica Skvortzow, 1932 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. lata Cleve-Euler, 1949 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. linearis Østrup, 1897 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. maculata M. Peragallo in Tempère & Peragallo, 1910 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. marginata Cleve, 1895 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. marina Kützing, 1833 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. minor H. Peragallo in H. Peragallo & M. Peragallo, 1897 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. neogenica Milovanova, 1955 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. salina Rabenhorst, 1871 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. salina Kützing, 1833 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. salinarum Agardh, 1832 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. salinarum Agardh ex Rabenhorst, 1864 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. solcaensis Tarnavschi, 1940 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. tumida Hustedt, 1927 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. tumidula ‘Grunow' Mills, 1933 (uncertain, unassessed)
    » Variety Achnanthes brevipes var. typica Cleve, 1895 (uncertain, unassessed)
  » Species Achnanthes coarctata (Brébisson ex W.Smith) Grunow, 1880
    » Variety Achnanthes coarctata var. sinica Qi & Xie, 1984
    » Variety Achnanthes coarctata var. coarctata (Brébisson ex W. Smith) Grunow in Cleve & Grunow, 1880 represented as Achnanthidium coarctatum var. coarctatum Brébisson ex W. Smith, 1855
    » Variety Achnanthes coarctata var. elineata (Lagerstedt) Otto Müller, 1909 represented as Achnanthidium coarctatum var. elineatum Lagerstedt, 1873
    » Variety Achnanthes coarctata var. otrantina (Rabenhorst) H. Peragallo in Pelletan, 1889 represented as Achnanthidium otrantinum Rabenhorst, 1853
    » Forma Achnanthes coarctata f. antarctica M. Peragallo, 1921 (uncertain, unassessed)
    » Forma Achnanthes coarctata f. falklandica Carlson, 1913 (uncertain, unassessed)
    » Subspecies Achnanthes coarctata subsp. fukinensis Skvortzov, 2012 (uncertain)
    » Variety Achnanthes coarctata var. constricta Krasske, 1929 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. distorta M. Peragallo, 1921 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. elliptica Krasske, 1929 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. parallella Venkataraman, 1939 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. petri-pazmanyii Z. Éber, 1930 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. rhomboidea Tarnavschi & Jitariu, 1955 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. sigmoideum ‘Brébisson' H. Peragallo in Pelletan, 1889 (uncertain, unassessed)
    » Variety Achnanthes coarctata var. sinaensis Hustedt, 1949 (uncertain, unassessed)
  » Species Achnanthes confusa Manguin
  » Species Achnanthes depressa (Cleve) Hustedt, 1933
    » Variety Achnanthes depressa var. depressa (Cleve) Hustedt, 1933 represented as Navicula depressa Cleve, 1891
    » Variety Achnanthes depressa var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes depressa var. lanceolata Cleve-Euler, 1939 (uncertain, unassessed)
  » Species Achnanthes drepanocladoides Skvortzov, 2012
  » Species Achnanthes elata (Leuduger-Fortmorel) Gandhi, 1960
  » Species Achnanthes eureka Álvarez-Blanco & S.Blanco, 2014
  » Species Achnanthes exigua Grunow, 1880
    » Variety Achnanthes exigua var. angustirostrata (Krasske) Lange-Bertalot in Lange-Bertalot & Krammer, 1989 represented as Achnanthes exigua f. angustirostrata Krasske, 1939
    » Variety Achnanthes exigua var. constricta (Torka) Hustedt, 1930 represented as Cocconeis exigua var. constricta Torka, 1909
    » Variety Achnanthes exigua var. constricta (Grunow) Hustedt, 1921 accepted as Achnanthes exigua Grunow, 1880 (synonym)
    » Variety Achnanthes exigua var. heterovalva Krasske, 1923 accepted as Achnanthidium exiguum var. heterovalvum (G.Krasske) D.B.Czarnecki, 1994 (misspelling and Basionym)
    » Forma Achnanthes exigua f. angustirostrata Krasske, 1939 (uncertain, unassessed)
    » Forma Achnanthes exigua f. aperta Guermeur, 1954 (uncertain, unassessed)
    » Forma Achnanthes exigua f. heterovalvata Krasske, 1923 (uncertain, unassessed)
    » Forma Achnanthes exigua f. profunda Manguin, 1954 (uncertain, unassessed)
    » Forma Achnanthes exigua f. semiaperta Guermeur, 1954 (uncertain, unassessed)
    » Forma Achnanthes exigua f. subcapitata Suxena & Venkateswarlu, 1968 (uncertain, unassessed)
    » Forma Achnanthes exigua f. subglobosa Manguin in Bourrelly & Manguin, 1952 (uncertain, unassessed)
    » Forma Achnanthes exigua f. subglobulosa ‘Manguin' according to Guermeur, 1954 (uncertain, unassessed)
    » Variety Achnanthes exigua var. baikalensis Skvortzow, 1937 (uncertain, unassessed)
    » Variety Achnanthes exigua var. capitata Hustedt, 1934 (uncertain, unassessed)
    » Variety Achnanthes exigua var. capitata Amossé, 1921 (uncertain, unassessed)
    » Variety Achnanthes exigua var. elliptica Hustedt, 1937 (uncertain, unassessed)
    » Variety Achnanthes exigua var. exigua Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes exigua var. exigua Pantocsek, 1902 (uncertain, unassessed)
    » Variety Achnanthes exigua var. globulosa Guermeur, 1954 (uncertain, unassessed)
    » Variety Achnanthes exigua var. indica Skvortzow, 1935 (uncertain, unassessed)
    » Variety Achnanthes exigua var. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Variety Achnanthes exigua var. rhombica Skvortzov, 2012 (uncertain)
    » Variety Achnanthes exigua var. siamense Hirano, 1967 (uncertain, unassessed)
    » Variety Achnanthes exigua var. staurophora Pantocsek, 1905 (uncertain, unassessed)
    » Variety Achnanthes exigua var. tenuirostrata Guermeur, 1954 (uncertain, unassessed)
    » Variety Achnanthes exigua var. typica Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes exigua var. undulata Frenguelli, 1953 (uncertain, unassessed)
    » Variety Achnanthes exigua var. yabeana Skvortzow & Noda, 1971 (uncertain, unassessed)
    » Variety Achnanthes exigua var. yabeana Skvortzov (uncertain)
  » Species Achnanthes expressa J. R. Carter in Hartley, 1986
  » Species Achnanthes fluviatilis A.Cleve, 1953
    » Variety Achnanthes fluviatilis var. fluviatilis Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes fluviatilis var. perstriata Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes fugei J.R.Carter, 1963
  » Species Achnanthes glabrata Grunow
    » Variety Achnanthes glabrata var. auklandica Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes glabrata var. glabrata Grunow, 1863 (uncertain, unassessed)
  » Species Achnanthes inflata (Kützing) Grunow, 1867
    » Variety Achnanthes inflata var. elata (Leuduger-Fortmorel) Hustedt, 1937 represented as Navicula elata Leuduger-Fortmorel, 1879
    » Variety Achnanthes inflata var. inflata (Kützing) Grunow, 1868 represented as Stauroneis inflata var. inflata Kützing, 1844
    » Variety Achnanthes inflata var. smithiana (Greville) Cleve, 1895 represented as Monogramma smithiana Greville, 1866
    » Forma Achnanthes inflata f. elatoides Cholnoky, 1954 (uncertain, unassessed)
    » Forma Achnanthes inflata f. subcostata Lenoble & Manguin, 1949 (uncertain, unassessed)
    » Forma Achnanthes inflata f. vidarbhensis Sarode & Kamat, 1980 (uncertain, unassessed)
    » Variety Achnanthes inflata var. gibba Gandhi, 1960 (uncertain, unassessed)
    » Variety Achnanthes inflata var. inflatissima Zanon, 1949 (uncertain, unassessed)
    » Variety Achnanthes inflata var. javanica Gandhi, 1966 (uncertain, unassessed)
    » Variety Achnanthes inflata var. sigmata Otto Müller, 1909 (uncertain, unassessed)
    » Variety Achnanthes inflata var. signata ‘O. Müller' VanLandingham, 1967 (uncertain, unassessed)
    » Variety Achnanthes inflata var. sinica Skvortzow, 1929 (uncertain, unassessed)
  » Species Achnanthes jilinensis Huang in Huang et al., 1983 †
  » Species Achnanthes lacunarum Hustedt, 1930
    » Variety Achnanthes lacunarum var. fonticola Hustedt in Schmidt et al., 1937 (uncertain, unassessed)
    » Variety Achnanthes lacunarum var. lacunarum Hustedt, 1930 (uncertain, unassessed)
  » Species Achnanthes lemmermannii Hustedt, 1933
    » Subspecies Achnanthes lemmermannii subsp. lineata Salah, 1953
    » Variety Achnanthes lemmermannii var. lemmermannii Hustedt, 1933 (uncertain, unassessed)
    » Variety Achnanthes lemmermannii var. lineata Salah, 1953 (uncertain, unassessed)
    » Variety Achnanthes lemmermannii var. obtusa Hustedt, 1939 (uncertain, unassessed)
    » Variety Achnanthes lemmermannii var. subcapitata Fusey, 1951 (uncertain, unassessed)
  » Species Achnanthes longipes C.Agardh, 1824
    » Forma Achnanthes longipes f. major elongata Zimmermann
      » Subforma Achnanthes longipes f. major elongata Zimmermann, 1909 (uncertain, unassessed)
    » Variety Achnanthes longipes var. carmichaelii (Greville) Brébisson, 1838 represented as Achnanthes carmichaeli Greville in Hooker, 1833
    » Forma Achnanthes longipes f. elliptica Foged, 1984 (uncertain, unassessed)
    » Forma Achnanthes longipes f. elongata Agardh, 1832 (uncertain, unassessed)
    » Forma Achnanthes longipes f. lata Zimmermann, 1910 (uncertain, unassessed)
    » Forma Achnanthes longipes f. minor Cleve, 1878 (uncertain, unassessed)
      » Subforma Achnanthes longipes f. minor decussata Zimmermann, 1909 (uncertain, unassessed)
    » Variety Achnanthes longipes var. carmichaelii Smejev, 1872 (uncertain, unassessed)
    » Variety Achnanthes longipes var. constricta Grunow in Juhlin-Dannfelt, 1882 (uncertain, unassessed)
    » Variety Achnanthes longipes var. fossilis Pantocsek, 1902 (uncertain, unassessed)
    » Variety Achnanthes longipes var. javanica Grunow in Cleve & Möller, 1878 (uncertain, unassessed)
    » Variety Achnanthes longipes var. lata Agardh, 1832 (uncertain, unassessed)
    » Variety Achnanthes longipes var. longipes Agardh, 1824 (uncertain, unassessed)
    » Variety Achnanthes longipes var. minor Agardh, 1832 (uncertain, unassessed)
    » Variety Achnanthes longipes var. minutissima Tempère, 1908 (uncertain, unassessed)
    » Variety Achnanthes longipes var. seafordiana F.W. Mills, 1933 (uncertain, unassessed)
  » Species Achnanthes lorenziana Grunow ex A.Schmidt, 1895
  » Species Achnanthes manguinii Hustedt
    » Variety Achnanthes manguinii var. elliptica Manguin in Bourrelly & Manguin, 1954 represented as Psammothidium ellipticomanguinii Van de Vijver, 2019 (New name, new status in the genus Psammothidium)
    » Variety Achnanthes manguinii var. manguinii Hustedt, 1952 (uncertain, unassessed)
  » Species Achnanthes maolanensis P. Yu, J.P. Kociolek & Q-M. You in You et al., 2019
  » Species Achnanthes marginulata Grunow, 1880
  » Species Achnanthes medioconvexa Zhu & Chen, 1996
  » Species Achnanthes mesoconstricta Zhu & Chen, 1996
  » Species Achnanthes modesta Manguin, 1952
  » Species Achnanthes muscorum M.Peragallo
    » Variety Achnanthes muscorum var. elliptica Frenguelli & Orlando, 1958 (uncertain, unassessed)
    » Variety Achnanthes muscorum var. minor M. Peragallo, 1921 (uncertain, unassessed)
    » Variety Achnanthes muscorum var. muscorum M. Peragallo, 1921 (uncertain, unassessed)
  » Species Achnanthes obesa (Greville, 1865)
  » Species Achnanthes obscura (Krasske) Lange-Bertalot & M.Willmann, 1996
  » Species Achnanthes oestrupii (Cleve-Euler) Hustedt, 1930
    » Variety Achnanthes oestrupii var. aperta (J.R.Carter) Lange-Bertalot, 1989 represented as Achnanthes aperta J.R.Carter, 1981
    » Variety Achnanthes oestrupii var. ostrupii (A. Cleve) A. Cleve-Euler, 1953 represented as Achnanthes lanceolata var. oestrupii A.Cleve, 1922
    » Variety Achnanthes oestrupii var. ostrupii (Cleve-Euler) Hustedt, 1930 represented as Achnanthes lanceolata var. oestrupii A.Cleve, 1922
    » Variety Achnanthes oestrupii var. pungens (A.Cleve) Lange-Bertalot, 1989 represented as Achnanthes elliptica var. pungens Cleve-Euler, 1934
    » Variety Achnanthes oestrupii var. rostrata (Hustedt) Cleve-Euler, 1953 represented as Achnanthes lanceolata var. rostrata Hustedt, 1911
    » Variety Achnanthes oestrupii var. baikalensis Skvortzov, 2012 (uncertain)
    » Variety Achnanthes oestrupii var. bicapitata Cleve-Euler, 1939 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. lanceolata Hustedt in Schmidt et al., 1937 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. lanceolata Hustedt ex Simonsen, 1987 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. minor Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. minuta Skvortzow, 1937 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. nipponica Skvortzow & Noda, 1971 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. nipponica Skvortzov, 2012 (uncertain)
    » Variety Achnanthes oestrupii var. parvula R.Patrick, 1945 (uncertain, unassessed)
    » Variety Achnanthes oestrupii var. typica Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes ostenii J.Frenguelli
    » Variety Achnanthes ostenii var. mesogongyla Frenguelli, 1933 (uncertain, unassessed)
    » Variety Achnanthes ostenii var. ostenii Frenguelli, 1933 (uncertain, unassessed)
    » Variety Achnanthes ostenii var. parva Frenguelli, 1933 (uncertain, unassessed)
  » Species Achnanthes petersenii Hustedt, 1937
    » Variety Achnanthes petersenii var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes petersenii var. petersenii Hustedt, 1936 (uncertain, unassessed)
    » Variety Achnanthes petersenii var. subhyalina Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes prominula Z.Levkov & S.Tofilovska, 2014
  » Species Achnanthes pseudobrevipes Aleem, 1950
  » Species Achnanthes pseudocoarctata Z.Levkov & S.Tofilovska, 2014
  » Species Achnanthes saccula J.R.Carter, 1981
  » Species Achnanthes saeptata
    » Variety Achnanthes saeptata var. doljensis Jurilj, 1957 (uncertain, unassessed)
    » Variety Achnanthes saeptata var. sussedana Jurilj, 1957 (uncertain, unassessed)
  » Species Achnanthes secretitaeniata Toyoda, Tanaka & Williams, 2009
  » Species Achnanthes striata Skvortzov, 1937
    » Variety Achnanthes striata var. rostrata Skabichevskii, 1936 (uncertain, unassessed)
  » Species Achnanthes trachyderma (F.Meister, 1934)
  » Species Achnanthes trinodis (W.Smith) Grunow, 1880
  » Species Achnanthes vistulana A. Witkowski, 1994
  » Species Achnanthes agglutinans Grunow in Cleve & Möller, 1879 (nomen nudum)
  » Species Achnanthes antiqua ‘M. Peragallo, 1913' according to Hustedt, 1933 (nomen nudum, unassessed)
  » Species Achnanthes baltalensis H.P.Gandhi, 1998 † (nomen nudum, Invalid - type not designated)
    » Variety Achnanthes baltalensis var. ovalis H.P.Gandhi, 1998 † (nomen nudum, Invalid - type not designated)
  » Species Achnanthes basaltensis Lohman, 1957 † (nomen nudum, Invalid - not effectively published)
  » Species Achnanthes antique Lauby represented as Achnanthes antiqua Lauby, 1910 †
  » Species Achnanthes aperta J.R.Carter, 1981 represented as Skabitschewskia aperta (Carter) Kulikovskiy & Lange-Bertalot, 2015 (unassessed)
  » Species Achnanthes auerii Krasske, 1949 † represented as Achnanthes aueri Krasske, 1949 † (Typographical variant (orthographically incorret according to ICN))
  » Species Achnanthes biconfusa VanLandingham, 1967 represented as Nupela biconfusa (VanLandingham) C.E.Wetzel & Ector, 2018 (homotypic synonym)
  » Species Achnanthes bongrainii (M. Peragallo) Mann, 1937 represented as Achnanthepyla bongrainii var. bongrainii Perag., 1921
  » Species Achnanthes borealis A.Cleve, 1895 represented as Skabitschewskia borealis (Cleve) Kulikovskey & Lange-Bertalot, 2015 (unassessed)
  » Species Achnanthes bottnica (Cleve) Cleve, 1895 represented as Achnanthes clevei var. bottnica Cleve, 1891
  » Species Achnanthes brevicostata (Hustedt) Lange-Bertalot & Krammer, 1989 represented as Cocconeis brevicostata var. brevicostata Hustedt, 1937
  » Species Achnanthes calcar Cleve, 1891 represented as Gliwiczia calcar (Cleve) M.Kulikovskiy, Lange-Bertalot & A.Witkowski, 2013
    » Forma Achnanthes calcar f. baicalensis Skvortzov, 1937 represented as Achnanthes baicalensis Skvortsov & Meyer, 1928
    » Forma Achnanthes calcar f. calcar Cleve, 1891 (uncertain, unassessed)
    » Variety Achnanthes calcar var. australis Playfair, 1914 (uncertain, unassessed)
    » Variety Achnanthes calcar var. pulcherrima Playfair, 1914 (uncertain, unassessed)
  » Species Achnanthes capitellata (A. Cleve) Cleve-Euler, 1948 represented as Navicula capitellata Cleve-Euler, 1943
  » Species Achnanthes cataractarum (Hustedt) Lange-Bertalot & Krammer, 1989 represented as Cocconeis cataractarum Hustedt in Schmidt, 1936
  » Species Achnanthes citrina (Schmidt in Schmidt et al.) M. Peragallo, 1897 represented as Cocconeis citrina Schmidt in Schmidt et al., 1895
  » Species Achnanthes citronella (A.Mann) Hustedt, 1937 represented as Cocconeis citronella Mann, 1925
  » Species Achnanthes congolensis Hustedt, 1949 represented as Achnanthes atomus var. congolensis Hust., 1949
  » Species Achnanthes contracta (Schumann) De Toni, 1891 represented as Achnanthidium contractum Schumann, 1867
  » Species Achnanthes cryptocephala (Grunow) M.Peragallo, 1897 represented as Achnanthes minutissima var. cryptocephala Grunow, 1880
  » Species Achnanthes curta (A.Cleve) A.Berg ex Cleve-Euler, 1953 represented as Pinnularia curta var. curta A. Cleve, 1900
    » Forma Achnanthes curta f. perminuta Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes delicatula (Kützing) Brun, 1880 represented as Achnanthidium delicatulum f. delicatulum Kützing, 1844
    » Subspecies Achnanthes delicatula subsp. septentrionalis (Østrup) Lange-Bertalot in Lange-Bertalot & Krammer, 1989
    » Variety Achnanthes delicatula var. australis Manguin in Bourrelly & Manguin, 1954
    » Forma Achnanthes delicatula f. angustata (Gutwinski) Gutwinski, 1893 represented as Achnanthidium delicatulum f. angustatum Gutwinski, 1890
    » Variety Achnanthes delicatula var. delicatula (Kützing) Grunow in Cleve & Grunow, 1880 represented as Achnanthidium delicatulum f. delicatulum Kützing, 1844
    » Variety Achnanthes delicatula var. rostrata (Schulz) Cleve-Euler, 1932 represented as Achnanthes hauckiana var. rostrata Schulz, 1926
    » Variety Achnanthes delicatula var. subcapitata (Østrup) Cleve-Euler, 1953 represented as Achnanthes septentrionalis var. subcapitata Oestrup, 1910
    » Variety Achnanthes delicatula var. wislouchii (Poretzky) Zabelina et al., 1951 represented as Microneis delicatula var. wislouchii Poretzky, 1925
    » Subspecies Achnanthes delicatula subsp. engelbrechtii (Cholnoky) Lange-Bertalot in Krammer & Lange-Bertalot in Ettl et al., 1991 accepted as Achnanthes delicatula subsp. engelbrechtii (Cholnoky) Lange-Bertalot, 1993 (Place of publication of basionym not cited completely. )
    » Forma Achnanthes delicatula f. angusta Gutwinski, 1893 (uncertain, unassessed)
    » Variety Achnanthes delicatula var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes delicatula var. heterostriata Scheschukova in Poretzky, Jousé & Scheschukova, 1934 (uncertain, unassessed)
    » Variety Achnanthes delicatula var. magellanica Frenguelli, 1924 (uncertain, unassessed)
    » Variety Achnanthes delicatula var. pacis Frenguelli, 1923 (uncertain, unassessed)
    » Variety Achnanthes delicatula var. robusta Hustedt, 1934 (uncertain, unassessed)
  » Species Achnanthes densestriata (Hustedt) Hustedt, 1962 represented as Navicula densestriata var. densestriata Hustedt, 1922
    » Variety Achnanthes densestriata var. densestriata Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes densestriata var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes densestriata var. subalpina Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes fimbriata (Grunow) R.Ross, 1963 represented as Schizostauron fimbriatum Grunow, 1867
  » Species Achnanthes flexella (Kützing) Mann, 1937 represented as Cymbella flexella Kützing, 1844
    » Forma Achnanthes flexella f. alpina Brun, 1901 (uncertain, unassessed)
    » Variety Achnanthes flexella var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes gainii (M. Peragallo) Mann, 1937 represented as Achnanthepyla gainii var. gainii Perag., 1921
  » Species Achnanthes gamma (Cleve) Ainosd represented as Navicula gamma var. gamma Cleve, 1893
  » Species Achnanthes gibberula Grunow, 1880 represented as Crenotia gibberula (Grunow) Wojtal
    » Forma Achnanthes gibberula f. interrupta (Anisimova & Poretzky) Cleve-Euler, 1953 represented as Achnanthes gibberula var. interrupta Poretzky & Anissimova, 1933
    » Variety Achnanthes gibberula var. angustior Grunow in Cleve, 1895 represented as Crenotia angustior (Grunow) Wojtal (unassessed)
    » Variety Achnanthes gibberula var. elliptica (Krasske) Cleve-Euler, 1953 represented as Achnanthes grimmei var. elliptica Krasske, 1927
    » Forma Achnanthes gibberula f. angustior ‘Grunow ex Van Heurck' VanLandingham, 1967 (uncertain, unassessed)
    » Variety Achnanthes gibberula var. angustior Grunow in Van Heurck, 1882-1885 (uncertain, unassessed)
    » Variety Achnanthes gibberula var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes gibberula var. gibberula Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes gibberula var. interrupta Poretzky & Anissimova, 1933 (uncertain, unassessed)
  » Species Achnanthes grimmei Krasske, 1925 represented as Crenotia grimmei (Krasske) Wojtal (unassessed)
    » Variety Achnanthes grimmei var. elliptica Krasske, 1927 (uncertain, unassessed)
    » Variety Achnanthes grimmei var. elliptica Krasske in Hustedt, 1930 (uncertain, unassessed)
    » Variety Achnanthes grimmei var. grimmei Krasske, 1925 (uncertain, unassessed)
    » Variety Achnanthes grimmei var. hyalina Hustedt, 1949 (uncertain, unassessed)
    » Variety Achnanthes grimmei var. inflata Krasske, 1927 (uncertain, unassessed)
  » Species Achnanthes gysingensis (Foged) Lange-Bertalot, 1989 represented as Navicula gysingensis Foged, 1952
  » Species Achnanthes hedinii Hustedt represented as Crenotia hedinii (Hustedt) Rioual, Ector & C.E.Wetzel
  » Species Achnanthes helvetica (Hustedt) Lange-Bertalot, 1989 represented as Achnanthes austriaca var. helvetica Hust., 1933
    » Variety Achnanthes helvetica var. alpina Flower & Jones, 1989 (uncertain, unassessed)
    » Variety Achnanthes helvetica var. minor Flower & Jones, 1989 (uncertain, unassessed)
  » Species Achnanthes heterovalvata (Krasske) Frenguelli, 1942 represented as Achnanthes exigua f. heterovalvata Krasske, 1923
  » Species Achnanthes hustedtii (Krasske) Reimer, 1966 represented as Cocconeis hustedtii Krasske, 1923
  » Species Achnanthes jackii (Rabenhorst) Tempère & Peragallo, 1909 represented as Achnanthidium jackii Rabenhorst, 1861
  » Species Achnanthes jentzschi (Grunow) P.Schulz, 1926 represented as Navicula jentzschii f. jentzschii Grunow, 1882
  » Species Achnanthes kriegeri Krasske, 1943 represented as Rossithidium kriegeri (Krasske) Bahls, 2019
  » Species Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 represented as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999
    » Forma Achnanthes lanceolata f. ventricosa Hustedt
    » Subspecies Achnanthes lanceolata subsp. polymorpha Skabichevskj, 1987
    » Variety Achnanthes lanceolata var. elliptico-lanceolata (Schaarschmidt) Ross in Hartley, 1986
    » Variety Achnanthes lanceolata var. faeroensis G.S.Oesterreich
    » Forma Achnanthes lanceolata f. capitata (O. Müller) Hustedt, 1933 represented as Achnanthes lanceolata var. capitata O. Muller, 1909
    » Forma Achnanthes lanceolata f. diminuta Cleve-Euler, 1932
    » Forma Achnanthes lanceolata f. dubia (Grunow) Ko-Bayashi, 1965 represented as Achnanthes lanceolata var. dubia sensu van Heurck
    » Forma Achnanthes lanceolata f. rostrata (Oestrup) Hustedt, 1957 represented as Achnanthes rostrata Oestrup, 1902
    » Forma Achnanthes lanceolata f. ventricosa (Hustedt) Vanlandingham, 1967 represented as Achnanthes lanceolata var. ventricosa Hustedt, 1914
    » Variety Achnanthes lanceolata var. apiculata R.M.Patrick, 1945 represented as Planothidium apiculatum (Patrick) R.Lowe in Johansen et al., 2004 (unassessed)
    » Variety Achnanthes lanceolata var. baicalensis (Skvortzov) Sheshukova represented as Achnanthes lanceolata f. baicalensis Skvortzow & Meyer, 1928
    » Variety Achnanthes lanceolata var. boyei (Østrup) Lange-Bertalot, 1989 represented as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999
    » Variety Achnanthes lanceolata var. elliptico-lanceolata (Schaarsmidt) R.Ross, 1986 represented as Achnanthes haynaldii var. elliptica-lanceolata Schaarschmidt, 1881
    » Variety Achnanthes lanceolata var. haynaldii (Schaarschmidt) Cleve, 1894 represented as Planothidium haynaldii (Schaarschmidt) Lange-Bertalot, 1999
    » Variety Achnanthes lanceolata var. intermedia (A.Cleve) represented as Achnanthes haynaldii var. intermedia Cleve-Euler in Florin, 1944
    » Variety Achnanthes lanceolata var. lanceolatoides (Sovereign) Reimer, 1966 represented as Achnanthes lanceolatoides H.E.Sovereign, 1958
    » Variety Achnanthes lanceolata var. minor (Schulz) Lange-Bertalot, 1993 represented as Achnanthes lanceolata f. minor Schulz, 1926
    » Variety Achnanthes lanceolata var. minuta (Skvortzow) Sheshukova in Zabelina et al., 1951 represented as Achnanthes oestrupii var. minuta Skvortzow, 1937
    » Variety Achnanthes lanceolata var. oestrupii A.Cleve, 1922 represented as Skabitschewskia oestrupii (Cleve-Euler) Kulikovskiy & Lange-Bertalot, 2015 (unassessed)
    » Variety Achnanthes lanceolata var. rostrata Hustedt, 1911 represented as Planothidium rostratoholarcticum Lange-Bertalot & Bąk in Bąk & Lange-Bertalot, 2014 (Replaced synonym)
    » Subspecies Achnanthes lanceolata subsp. biporoma (Hohn & Hellerman) Lange-Bertalot, 1993 accepted as Planothidium biporomum (M.H.Hohn & Hellerman) Lange-Bertalot, 1999 (synonym)
    » Subspecies Achnanthes lanceolata subsp. dubia (Grunow) Lange-Bertalot, 1991 accepted as Planothidium dubium (Grunow) Round & Bukhtiyarova, 1996
    » Subspecies Achnanthes lanceolata subsp. lanceolata accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999
    » Subspecies Achnanthes lanceolata subsp. rostrata (Oestrup) Lange-Bertalot, 1991 accepted as Planothidium rostratum (Østrup) Lange-Bertalot, 1999 (synonym)
    » Variety Achnanthes lanceolata var. amissa Reimer accepted as Achnanthes lanceolata var. omissa Reimer, 1966 (misspelling)
    » Variety Achnanthes lanceolata var. magna (Straub) Lange-Bertalot, 1993 accepted as Planothidium frequentissimum var. magnum (F.Straub) Lange-Bertalot, 1999
    » Forma Achnanthes lanceolata f. baicalensis Skvortzow & Meyer, 1928 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. elongata Lauby, 1910 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. minor Schulz, 1926 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. parallela Fusey, 1950 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. pura Mayer, 1916 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. rhombica Carter, 1966 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. semipura Mayer, 1916 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. abbreviata Reimer, 1966 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. argunensis Skvortzov, 2012 (uncertain)
    » Variety Achnanthes lanceolata var. bimaculata Hustedt, 1950 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. brasiliensis Zimmermann, 1919 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. capitata O. Muller, 1909 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. crassa Cleve-Euler, 1915 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. dubia Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. dubia sensu van Heurck (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. elliptica Cleve, 1891 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. fennica Cleve-Euler, 1934 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. frequentissima Lange-Bertalot, 1993 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. frequentissima Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. frequentissima H. Lange-Bertalot in Lange-Bertalot & Krammer, 1989 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. magna (Straub) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. maxima M. Peragallo in Héribaud et al., 1920 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. minor (Schulz) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. minutissima Krasske, 1938 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. omissa Reimer, 1966 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. ovalis M. Peragallo in Héribaud, 1893 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. perpusilla Grunow, 1882 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. robusta Hustedt, 1937 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. rostrata Schulz, 1926 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. rostratiformis Lange-Bertalot, 1993 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. rusticum Steinecke (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. subinflata Østrup, 1918 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. tenuis Gonzalves & Gandhi, 1952 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. ventricosa Hustedt, 1914 (uncertain, unassessed)
  » Species Achnanthes lanceolata (Patrick) Lange-Bertalot, 1993 represented as Achnanthes lanceolata var. apiculata R.M.Patrick, 1945
  » Species Achnanthes lanceolata (Hohn & Hellerman) Lange-Bertalot, 1993 represented as Achnanthes biporoma M.H.Hohn & J.Hellerman, 1963
  » Species Achnanthes lanceolata (Sovereign) Lange-Bertalot, 1993 represented as Achnanthes lanceolatoides H.E.Sovereign, 1958
  » Species Achnanthes lanceolata (Hustedt) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 represented as Achnanthes lanceolata var. robusta Hustedt, 1937
  » Species Achnanthes lanceolata (Østrup) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 represented as Achnanthes rostrata Oestrup, 1902
    » Forma Achnanthes lanceolata f. faeroensis (Østrup) Cleve-Euler, 1953 represented as Achnanthes lanceolata var. faeroensis Østrup, 1901
    » Variety Achnanthes lanceolata var. lanceolata (Brébisson ex Kützing) Grunow in Cleve & Grunow, 1880 represented as Achnanthidium lanceolatum f. lanceolatum Brébisson ex Kützing, 1846
    » Variety Achnanthes lanceolata var. rostrata (Østrup) Hustedt, 1930 represented as Achnanthes rostrata Oestrup, 1902
    » Forma Achnanthes lanceolata f. diminutae Cleve-Euler, 1953 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. elliptica Jousé, 1939 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. fossilis Manguin, 1949 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. minores Krasske, 1929 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. minuta Grunow in Van Heurck, 1880-1887 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. rostrata Esyreva, 1945 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. typica Manguin, 1943 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. typica ‘Meister' VanLandingham, 1967 (uncertain, unassessed)
    » Forma Achnanthes lanceolata f. typica Mayer, 1916 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. elegans Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. elliptica sensu Schulz, 1926 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. elliptica Schulz ex Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. faeroensis Østrup, 1901 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. genuina ‘Mayer' Mills, 1933 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. inflata ‘Mayer' Mills, 1933 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. laevistiata Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. laterostrata Gandhi, 1966 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. minima Szemes, 1931 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. minutissima Tempère & Peragallo, 1908 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. ovalis Héribaud, 1903 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. rhomboidalis ‘A. Mayer' Mills, 1933 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. rhomboidea Gandhi, 1966 (uncertain, unassessed)
    » Variety Achnanthes lanceolata var. rostellatum ‘Hust. Mayer' Mills, 1919 (uncertain, unassessed)
  » Species Achnanthes lanceolata (Hustedt) Lange-Bertalot, 1993 represented as Achnanthes lanceolata var. robusta Hustedt, 1937
  » Species Achnanthes lanceolata (Grunow) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 represented as Achnanthes lanceolata var. dubia sensu van Heurck
  » Species Achnanthes lanceolata (Sovereign) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 represented as Achnanthes lanceolatoides H.E.Sovereign, 1958
  » Species Achnanthes lanceolata (Østrup) Lange-Bertalot, 1993 represented as Achnanthes rostrata Oestrup, 1902
  » Species Achnanthes lanceolata (Patrick) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 represented as Achnanthes lanceolata var. apiculata R.M.Patrick, 1945
  » Species Achnanthes lanceolata (Hohn & Hellerman) Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 represented as Achnanthes biporoma M.H.Hohn & J.Hellerman, 1963
  » Species Achnanthes lobata (Schwartz ex Rabenhorst) Hustedt, 1952 represented as Navicula lobata Schwartz in Rabenhorst, 1877
  » Species Achnanthes looseri Frenguelli, 1930 represented as Planothidium looseri (Frenguelli) Rivero & Cruces, 2009 (unassessed)
    » Variety Achnanthes looseri var. lanceolata Frenguelli, 1935 (uncertain, unassessed)
  » Species Achnanthes maxima A.Cleve, 1953 represented as Achnanthidium maximum Cleve-Euler, 1895
  » Species Achnanthes microcephala (Kützing) Grunow, 1880 represented as Achnanthidium microcephalum Kützing, 1844
  » Species Achnanthes microcephala (Kützing) Cleve, 1895 represented as Achnanthidium microcephalum Kützing, 1844
    » Variety Achnanthes microcephala var. gracillima (Meister) Cleve-Euler, 1953 represented as Microneis gracillima Meister, 1912
    » Variety Achnanthes microcephala var. microcephala (Kützing) Cleve, 1895 represented as Achnanthidium microcephalum Kützing, 1844
    » Forma Achnanthes microcephala f. magna Cleve-Euler, 1932 (uncertain, unassessed)
    » Forma Achnanthes microcephala f. minuta Cleve-Euler, 1953 (uncertain, unassessed)
    » Forma Achnanthes microcephala f. scotica J.R.Carter, 1981 accepted as Achnanthidium caledonicum (Lange-Bertalot) Lange-Bertalot, 1999 (uncertain, unassessed)
    » Variety Achnanthes microcephala var. cryptocephala Gutwinski, 1913 (uncertain, unassessed)
    » Variety Achnanthes microcephala var. typica Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes microscopica (Cholnoky) Lange-Bertalot & Krammer, 1989 represented as Cocconeis microscopica Cholnoky, 1959
  » Species Achnanthes minuta (Cleve) Patrick & Freese, 1961 represented as Achnanthidium minutum Cleve, 1891
  » Species Achnanthes norvegica Hustedt represented as Achnanthes montana var. norvegica Hustedt, 1931
  » Species Achnanthes obliqua (Gregory) Hustedt, 1924 represented as Psammothidium obliquum (W. Gregory, 1856) Potapova, 2018
    » Forma Achnanthes obliqua f. maior Foged, 1981 (uncertain, unassessed)
  » Species Achnanthes obtusa (Schumann) De Toni, 1891 represented as Achnanthidium obtusum Schumann, 1867
  » Species Achnanthes okunoi (Hustedt) Simonsen, 1988 represented as Navicula okunoi Hustedt, 1966
  » Species Achnanthes onegensis (Wislouch & Kolbe) Jouse, 1939 represented as Psammothidium obliquum (W. Gregory, 1856) Potapova, 2018
  » Species Achnanthes peragalli Brun & Héribaud-Joseph, 1893 represented as Skabitschewskia peragalli (Brun & Heribaud) Kulikovskiy & Lange-Bertalot, 2015 (synonym)
  » Species Achnanthes pinnularia (Tempère & Brun) Kanaya, 1963 represented as Rhaphoneis pinnularia Tempère & Brun in Brun & Tempère, 1889
  » Species Achnanthes placentuloides (Guslakov) Witkowski & Lange-Bertalot, 2000 represented as Cocconeis placentuloides Guslakov, 1992
  » Species Achnanthes poretzkii Jasnitsky represented as Skabitschewskia poretzkii (Jasnitsky) Kulikovskiy & Lange-Bertalot, 2015 (unassessed)
    » Variety Achnanthes poretzkii var. gracilis Jasnitsky, 1936 (uncertain, unassessed)
    » Variety Achnanthes poretzkii var. poretzkii Jasnitsky, 1936 (uncertain, unassessed)
  » Species Achnanthes pusilla Grunow in Cleve & Grunow, 1880
  » Species Achnanthes quadratarea (Østrup) M.Möller ex Foged, 1974 represented as Cocconeis quadratarea Østrup, 1910
  » Species Achnanthes reichardtiana (Grunow) Cleve, 1902 represented as Schizostauron reichardtianum Grunow, 1867
  » Species Achnanthes reichardtiana (Grunow) Hustedt, 1933 represented as Schizostauron reichardtianum Grunow, 1867
  » Species Achnanthes ricula Hohn & Hellerman, 1963 represented as Navigiolum ricula (M.H.Hohn & Hellerman) C.E.Wetzel & Ector, 2018 (homotypic synonym)
  » Species Achnanthes sacculus Carter in Carter & Bailey-Watts, 1981 represented as Psammothidium sacculum (J.R.Carter) L.Bukhtiyarova, 1996
  » Species Achnanthes salina (Kützing) Kützing, 1844 represented as Fragilaria salina Kützing, 1833
  » Species Achnanthes salvadoriana Hustedt, 1953 represented as Planothidium salvadorianum (Hustedt) Lange-Bertalot, 1999
  » Species Achnanthes sancti-paulii (Heiden in Heiden & Kolbe) Kobayasi & Sawatari, 1986 represented as Cocconeis sancti-pauli Heiden in Heiden & Kolbe, 1928
  » Species Achnanthes semifasciata (Østrup) M. Møller in Foged, 1974 represented as Navicula semifasciata Østrup, 1918
  » Species Achnanthes simplex (Peragallo) Frenguelli & Orlando, 1958 represented as Achnanthepyla simplex Perag., 1921
  » Species Achnanthes smithiana (Greville) K.Toyoda & D.M.Williams, 2005 represented as Monogramma smithiana Greville, 1866
  » Species Achnanthes soodensis (Krasske) Cleve-Euler, 1953 represented as Navicula soodensis var. soodensis Krasske, 1927
  » Species Achnanthes stolida (Krasske) Krasske, 1949 represented as Navicula stolida Krasske, 1939
  » Species Achnanthes strenzkei (Hustedt) Simonsen, 1987 represented as Navicula strenzkei Hustedt, 1962
  » Species Achnanthes subatomoides (Hustedt) Lange-Bertalot & Archibald, 1985 represented as Navicula subatomoides Hustedt, 1936
  » Species Achnanthes subconstricta (Meister) Toyoda represented as Achnanthes javanica var. subconstricta Meister, 1932
  » Species Achnanthes subhungarica (Gutwinski) De Toni, 1890 represented as Achnanthidium subhungaricum Gutwinski, 1890
  » Species Achnanthes subinflata (Østrup) Cleve-Euler, 1953 represented as Achnanthes lanceolata var. subinflata Østrup, 1918
  » Species Achnanthes subquadrata (Pantocsek) Tempère & Peragallo, 1909 represented as Achnanthes baldjicki var. subquadrata Pant., 1892 †
  » Species Achnanthes thermalis (Rabenhorst) Schoenfeld, 1907 represented as Achnanthidium thermale Rabenhorst, 1864
  » Species Achnanthes trinodis (Ralfs) Grunow, 1880 represented as Achnanthidium trinode Ralfs, 1861
  » Species Achnanthes tylophora (Reichelt) Heiden in A. Schmidt, 1903 represented as Stauroneis tylophora Reichelt, 1903
  » Species Achnanthes undulata (Schumann) De Toni, 1891 represented as Achnanthidium undulatum Schumann, 1867
  » Species Achnanthes unipunctata (Lyngbye) Greville represented as Fragilaria unipunctata Lyngbye, 1819
  » Species Achnanthes ventralis (Krasske) Lange-Bertalot, 1989 represented as Navicula ventralis Krasske, 1923
  » Species Achnanthes yabe Skvortzow, 1937 represented as Achnanthes exigua var. yabeana Skvortzov (unassessed)
  » Species Achnanthes aapajärvensis Cleve-Euler, 1934 accepted as Achnanthes aapajaervensis A.Cleve, 1934 (orthographic variant)
  » Species Achnanthes abundans Manguin in Bourrelly & Manguin, 1954 accepted as Psammothidium abundans (Manguin, Bourrelly & Manguin) L.Bukhtiyarova, 1996 (Basionym)
  » Species Achnanthes acidoclinata Lange-Bert., 1996 accepted as Psammothidium acidoclinatum (Lange-Bertalot) Lange-Bertalot, 1999 (Basionym)
  » Species Achnanthes adamantiformis (R.E.M.Archibald) R.E.M.Archibald, 1971 accepted as Navigiolum adamantiforme (Archibald) Taylor & Lange-Bertalot (Subsequent combination)
  » Species Achnanthes affinis Grunow, 1880 accepted as Achnanthidium affine (Grunow) Czarnecki, 1994 (Synonym)
  » Species Achnanthes agardhi (Kütz.) Cleve & J.D.Möller accepted as Achnanthes brevipes var. seriata (Agardh) Cleve, 1895 (Based on an illegitimate name)
  » Species Achnanthes alaskana R.M.Patrick & Freese, 1961 accepted as Achnanthes bioretii Germain, 1957 (Later taxonomic synonym)
  » Species Achnanthes alpestris (Brun) Lange-Bert. & Metzeltin, 1996 accepted as Eucocconeis alpestris (Brun) Lange-Bertalot, 1999 (Synonym)
  » Species Achnanthes altaica (V.S.Poretzky) A.Cleve, 1953 accepted as Psammothidium altaicum (Poretzky) L.Bukhtiyarova, 1996 (Synonym)
  » Species Achnanthes alteragracillima Lange-Bert., 1993 accepted as Achnanthidium gracillimum (Meister) Lange-Bertalot, 2004 (Synonym)
  » Species Achnanthes amoena Hust., 1952 accepted as Karayevia amoena (Hust.) Bukht., 2006 (synonym)
  » Species Achnanthes anastasiae Kaczmarska, 1985 accepted as Achnanthidium anastasiae (Kaczmarska) Chaudev & Gololobova (Synonym)
  » Species Achnanthes andicola (Cleve) Hust., 1911 accepted as Lemnicola hungarica (Grunow) F.E.Round & P.W.Basson, 1997 (unaccepted, Taxonomic synonym)
  » Species Achnanthes angustata C.Johnst., 1860 accepted as Gephyria media Arnott, 1860 (unaccepted, Homonym)
  » Species Achnanthes angustissima Jasn., 1936 accepted as Achnanthes dispar var. angustissima Jasnitsky (unaccepted, Basionym)
  » Species Achnanthes antiqua Moiseeva, 1959 † (unaccepted, later homonym of Achnanthes antique Lauby)
  » Species Achnanthes archibaldiana Lange-Bert., 1989 accepted as Rossithidium archibaldianum (Lange-Bertalot) L.N.Bukhtiyarova, 2008 (unaccepted, Synonym)
  » Species Achnanthes arctica (Cleve) A.Cleve, 1915 accepted as Achnanthes brevipes var. arctica (P. T. Cleve) T. Ko-Bayashi, 1965 (unaccepted, Synonym)
  » Species Achnanthes arcuata A.Cleve, 1939 accepted as Achnanthes astridii VanLand., 1967 (unaccepted, Illegitimate homonym)
  » Species Achnanthes arcus Hust., 1942 accepted as Achnanthidium arcus (Hustedt) Lange-Bertalot, 1999 (unaccepted, Synonym)
  » Species Achnanthes aretasii Manguin in Bourrelly & Manguin, 1955 accepted as Eucocconeis aretasii (E. Manguin) H. Lange-Bertalot in H. Lange-Bertalot & S. I. Genkal, 1999 (unaccepted, Synonym)
  » Species Achnanthes atalanta J.R.Carter, 1966 accepted as (unaccepted, Synonym)
  » Species Achnanthes atomus Hust., 1937 accepted as Achnanthidium atomus (Hustedt) Monnier, Lange-Bertalot & Ector in Monnier et al., 2004 (unaccepted, Synonym)
  » Species Achnanthes aueri Krasske, 1949 † accepted as Planothidium aueri (Krasske) H. Lange-Bertalot, 1999 (unaccepted, Synonym)
  » Species Achnanthes austriaca Hust., 1922 accepted as Eucocconeis austriaca (Hustedt) H. Lange-Bertalot apud H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999 (unaccepted, Synonym)
    » Forma Achnanthes austriaca f. intermedia Manguin, 1939
    » Variety Achnanthes austriaca var. dracomontana Cholnoky, 1957
    » Variety Achnanthes austriaca var. parallela Krasske, 1932
    » Variety Achnanthes austriaca var. tatrica Starmach, 1973
    » Variety Achnanthes austriaca var. capensis Cholnoky, 1959 (nomen nudum, Type not designated)
    » Variety Achnanthes austriaca var. austriaca Hust., 1922 represented as Achnanthes austriaca Hust., 1922 (unassessed)
    » Variety Achnanthes austriaca var. typica A.Cleve, 1953 represented as Achnanthes austriaca var. austriaca Hust., 1922 (unassessed)
    » Variety Achnanthes austriaca var. helvetica Hust., 1933 accepted as Psammothidium helveticum (Hustedt) L.N.Bukhtiyarova & Round, 1996 (Synonym)
    » Variety Achnanthes austriaca var. minor Flower accepted as Achnanthes helvetica var. minor Flower & Jones, 1989 (Non existing, unpublished name.)
    » Variety Achnanthes austriaca var. ventricosa Krasske, 1932 accepted as Psammothidium helveticum (Hustedt) L.N.Bukhtiyarova & Round, 1996 (Taxonomc synonym)
  » Species Achnanthes baccillarioides Bory, 1822 accepted as Achnanthes brevipes C.Agardh, 1824 (unaccepted, Nom. rej. )
  » Species Achnanthes bacillaris Ehrenberg, 1844 accepted as Achnanthes pachypus f. bacillaris (Ehrenberg) De Toni, 1891 (unaccepted, Synonym)
  » Species Achnanthes bahusiensis (Grunow) Lange-Bert., 1989 accepted as Astartiella bahusiensis (Grunow) Witkowski, Lange-Bertalot & Metzeltin, 1998 (unaccepted, Synonym)
  » Species Achnanthes baicalansis Skvortsov & Meyer accepted as Achnanthes baicalensis Skvortsov & Meyer, 1928 (unaccepted, misspelling)
  » Species Achnanthes baicalensis Skvortsov & Meyer, 1928 accepted as Planothidium baicalense (Skvortzow & K.I. Meyer) M.B. Edlund in M.B. Edlund, N. Soninkhishig, R.M. Williams & E.F. Stoermer, 2001 (unaccepted, Synonym)
  » Species Achnanthes baldjicki (Brightw.) Grunow † accepted as Rhaphoneis baldjikii (Brightwell) Grunow, 1862 (unaccepted, Synonym)
  » Species Achnanthes biasolettiana Grunow, 1880 accepted as Achnanthidium pyrenaicum (Hustedt) H.Kobayasi, 1997 (unaccepted, Taxonomic synonym)
    » Variety Achnanthes biasolettiana var. fossilis Freng., 1936 †
    » Variety Achnanthes biasolettiana var. perminuta Grunow ex De Toni, 1891
    » Variety Achnanthes biasolettiana var. minuta Woron., 1927 (taxon inquirendum, Illegitimate (homonymy))
    » Variety Achnanthes biasolettiana var. biasolettiana Grunow represented as Achnanthes biasolettiana Grunow, 1880 (Nominate variety)
    » Variety Achnanthes biasolettiana var. genuina A.Cleve, 1953 represented as Achnanthes biasolettiana Grunow, 1880 (unassessed)
    » Variety Achnanthes biasolettiana var. thienemannii (Hustedt) Lange-Bertalot, 1989 represented as Achnanthes thienemannii Hustedt, 1942
    » Forma Achnanthes biasolettiana f. minuta Grunow in Cleve, 1895 accepted as Achnanthes biasolettiana Grunow, 1880 (Taxonomic synonym)
    » Variety Achnanthes biasolettiana var. aapajarvensis (A.Cleve) Mölder & Tynni, 1972 accepted as Achnanthes aapajärvensis Cleve-Euler, 1934 (Invalid)
    » Variety Achnanthes biasolettiana var. jackii (Rabenh.) A.Cleve, 1932 accepted as Achnanthidium jackii Rabenhorst, 1861 (Synonym)
    » Forma Achnanthes biasolettiana f. minuta Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes biasolettiana var. perminuta Grunow ex Van Heurck, 1885 (uncertain, unassessed)
    » Variety Achnanthes biasolettiana var. subatomus Lange-Bertalot, 1989 (uncertain, unassessed)
    » Variety Achnanthes biasolettiana var. sublinearis Cleve (uncertain, unassessed)
    » Variety Achnanthes biasolettiana var. sublinearis Grunow ex Van Heurck (uncertain, unassessed)
  » Species Achnanthes biporoma M.H.Hohn & J.Hellerman, 1963 accepted as Planothidium biporomum (M.H.Hohn & Hellerman) Lange-Bertalot, 1999 (unaccepted, synonym)
  » Species Achnanthes boyei Østrup, 1918 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999 (unaccepted, heterotypic synonym)
    » Variety Achnanthes boyei var. lanceolata Huang, 1979 (uncertain, unassessed)
  » Species Achnanthes clevei Grunow, 1880 accepted as Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999 (unaccepted)
    » Variety Achnanthes clevei var. balcanica Hustedt, 1945
    » Forma Achnanthes clevei f. balcanica Hustedt, 1945 (uncertain, unassessed)
    » Forma Achnanthes clevei f. rostrata Hustedt, 1945 (uncertain, unassessed)
    » Variety Achnanthes clevei var. bottnica Cleve, 1891 (uncertain, unassessed)
    » Variety Achnanthes clevei var. capitata Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes clevei var. clevei Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes clevei var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes clevei var. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Variety Achnanthes clevei var. pavini Manguin, 1954 (uncertain, unassessed)
    » Variety Achnanthes clevei var. rostrata Hustedt, 1930 (uncertain, unassessed)
  » Species Achnanthes conspicua A.Mayer, 1919 accepted as Planothidium conspicuum (A.Mayer) M.Aboal, 2003 (unaccepted, synonym)
    » Variety Achnanthes conspicua var. brevicostata Skabichevskii, 1942 (uncertain, unassessed)
    » Variety Achnanthes conspicua var. brevistriata Hustedt, 1930 (uncertain, unassessed)
    » Variety Achnanthes conspicua var. conspicua A.Mayer, 1919 (uncertain, unassessed)
  » Species Achnanthes delicatula (Kützing) Grunow in Cleve & Grunow, 1880 accepted as Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 (unaccepted)
  » Species Achnanthes dispar Cleve, 1891 accepted as Planothidium dispar (Cleve) Witkowski, Lange-Bertalot & Metzeltin, 2000 (unaccepted)
  » Species Achnanthes elliptica (Cleve) Cleve-Euler, 1932 accepted as Planothidium joursacense (Héribaud-Joseph) Lange-Bertalot, 1999 (unaccepted, synonym)
  » Species Achnanthes engelbrechtii Cholnoky, 1955 accepted as Planothidium engelbrechtii (Cholnoky) Round & L.Bukhtiyarova, 1996 (unaccepted, synonym)
    » Variety Achnanthes engelbrechtii var. engelbrechtii Cholnoky, 1955 (uncertain, unassessed)
    » Variety Achnanthes engelbrechtii var. minuta Cholnoky, 1955 (uncertain, unassessed)
  » Species Achnanthes exilis Kützing, 1833 accepted as Achnanthidium exile (Kützing) Heiberg, 1863 (unaccepted)
    » Variety Achnanthes exilis var. minutissima Brun, 1880 (uncertain, unassessed)
  » Species Achnanthes flexella (Kützing) Brun, 1880 accepted as Eucocconeis flexella (Kützing) Meister, 1912 (unaccepted)
  » Species Achnanthes heteromorpha Grunow, 1880 accepted as Planothidium heteromorphum (Grunow) Lange-Bertalot, 1999 (unaccepted, synonym)
    » Variety Achnanthes heteromorpha var. binotata Frenguelli, 1953 (uncertain, unassessed)
    » Variety Achnanthes heteromorpha var. heteromorpha Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
  » Species Achnanthes holstii Cleve, 1882 accepted as Planothidium holstii (Cleve) Lange-Bertalot, 1999 (unaccepted)
    » Forma Achnanthes holstii f. cuneiformis Fusey, 1951 (uncertain, unassessed)
    » Variety Achnanthes holstii var. celtica Fusey, 1951 (uncertain, unassessed)
    » Variety Achnanthes holstii var. holstii Cleve, 1881 (uncertain, unassessed)
    » Variety Achnanthes holstii var. schwabei Krasske, 1939 (uncertain, unassessed)
  » Species Achnanthes hungarica (Grunow) Grunow, 1880 accepted as Lemnicola hungarica (Grunow) F.E.Round & P.W.Basson, 1997 (unaccepted)
    » Variety Achnanthes hungarica var. andicola (Cleve) Østrup, 1910 represented as Schizostauron andicolum Cleve, 1881
    » Variety Achnanthes hungarica var. hungarica (Grunow) Grunow in Cleve & Grunow, 1880 represented as Achnanthidium hungaricum Grunow, 1863
    » Variety Achnanthes hungarica var. jamalinensis Grunow represented as Achnanthes jamalinensis Grunow in Cleve & Grunow, 1880
    » Variety Achnanthes hungarica var. rivularia (Frenguelli) Frenguelli, 1933 represented as Achnanthes rivularia Frenguelli, 1925
    » Forma Achnanthes hungarica f. constricta Raabe, 1951 (uncertain, unassessed)
    » Forma Achnanthes hungarica f. polygonata Cleve-Euler, 1932 (uncertain, unassessed)
    » Forma Achnanthes hungarica f. semicruciata Cleve-Euler, 1932 (uncertain, unassessed)
    » Variety Achnanthes hungarica var. brevis Liebetanz, 1925 (uncertain, unassessed)
    » Variety Achnanthes hungarica var. linearis Abdul-Majeed, 1935 (uncertain, unassessed)
    » Variety Achnanthes hungarica var. miramaris Frenguelli, 1925 (uncertain, unassessed)
    » Variety Achnanthes hungarica var. rumelica Schaarschmidt, 1890 (uncertain, unassessed)
    » Variety Achnanthes hungarica var. senegalensis Guermeur, 1954 (uncertain, unassessed)
    » Variety Achnanthes hungarica var. tropica Frenguelli, 1953 (uncertain, unassessed)
  » Species Achnanthes kolbei Hustedt, 1930 accepted as Karayevia kolbei (Hudtedt) Bukhtiyarova, 1999 (unaccepted, synonym)
    » Variety Achnanthes kolbei var. elliptica Fusey, 1951 (uncertain, unassessed)
    » Variety Achnanthes kolbei var. kolbei Hustedt, 1930 (uncertain, unassessed)
  » Species Achnanthes kraeuselii Cholnoky, 1954 accepted as Achnanthes subhudsonis var. kraeuselii (Cholnoky) Cholnoky, 1956 (unaccepted, synonym)
    » Variety Achnanthes kraeuselii var. debegenica Cholnoky, 1954 (uncertain, unassessed)
    » Variety Achnanthes kraeuselii var. kraeuselii Cholnoky, 1954 (uncertain, unassessed)
  » Species Achnanthes kryophila J.B.Petersen, 1924 accepted as Achnanthes chlidanos M.H.Hohn & Hellerman, 1963 (unaccepted, synonym)
    » Subspecies Achnanthes kryophila subsp. distincta Skvortzov, 2012 (uncertain)
    » Variety Achnanthes kryophila var. africana Cholnoky, 1960 (uncertain, unassessed)
    » Variety Achnanthes kryophila var. densestriata Hustedt, 1934 (uncertain, unassessed)
    » Variety Achnanthes kryophila var. kryophila J.B.Petersen, 1924 (uncertain, unassessed)
    » Variety Achnanthes kryophila var. protracta Hustedt, 1937 (uncertain, unassessed)
    » Variety Achnanthes kryophila var. sinica Skvortzov, 2012 (uncertain)
    » Variety Achnanthes kryophila var. sublinearis Suxena & Venkateswarlu, 1968 (uncertain, unassessed)
  » Species Achnanthes lacus-baicali Skvortzov, 1937 accepted as Achnanthes lakus-baikali Skvortzow, 1937 (unaccepted, misspelling)
  » Species Achnanthes lapidosa Krasske, 1929 accepted as Achnanthidium lapidosum (Krasske) Kobayasi, 2002 (unaccepted)
    » Variety Achnanthes lapidosa var. appalachiana (Camburn & Lowe) Lange-Bertalot in Lange-Bertalot & Krammer, 1989 represented as Achnanthes subrostrata var. appalachiana Camburn & Lowe, 1978
    » Variety Achnanthes lapidosa var. chilensis (Krasske) Lange-Bertalot in Lange-Bertalot & Krammer, 1989 represented as Achnanthes lapidosa f. chilensis Krasske, 1939
    » Variety Achnanthes lapidosa var. subrostrata (Hustedt) Lange-Bertalot, 1989 represented as Achnanthes subrostrata Hustedt, 1942
    » Variety Achnanthes lapidosa var. producta Halasz, 1941 accepted as Achnanthes lapidosa f. producta Halos (wrong rank)
    » Forma Achnanthes lapidosa f. chilensis Krasske, 1939 (uncertain, unassessed)
    » Forma Achnanthes lapidosa f. producta Halos (uncertain, unassessed)
    » Forma Achnanthes lapidosa f. robusta Moiseeva, 1959 (uncertain, unassessed)
    » Variety Achnanthes lapidosa var. elliptica I.Kaczmarska, 1985 † (uncertain, unassessed)
    » Variety Achnanthes lapidosa var. lanceolata Hustedt, 1933 (uncertain, unassessed)
    » Variety Achnanthes lapidosa var. lapidosa Krasske, 1929 (uncertain, unassessed)
    » Variety Achnanthes lapidosa var. rostrata Fusey, 1951 (uncertain, unassessed)
  » Species Achnanthes lapponica (Hustedt) Hustedt, 1933 accepted as Eucocconeis quadratarea (Østrup) Lange-Bertalot, 1999 (unaccepted)
  » Species Achnanthes levanderi Hustedt, 1933 accepted as Psammothidium levanderi (Hustedt) L.Bukhtiyarova & Round, 1996 (unaccepted, synonym)
    » Variety Achnanthes levanderi var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes levanderi var. helvetica Hustedt, 1933 (uncertain, unassessed)
    » Variety Achnanthes levanderi var. levanderi Hustedt, 1933 (uncertain, unassessed)
  » Species Achnanthes lilljeborgei Grunow, 1881 accepted as Planothidium lilljeborgei (Grunow) Witkowski (unaccepted)
  » Species Achnanthes lineare W.Smith, 1855 accepted as Achnanthes linearis (W.Smith) Grunow, 1880 (unaccepted)
  » Species Achnanthes linearis (W.Smith) Grunow, 1880 accepted as Achnanthidium lineare W.Smith, 1855 (unaccepted, synonym)
    » Variety Achnanthes linearis var. jackii (Rabenhorst) Grunow, 1880 represented as Achnanthidium jackii Rabenhorst, 1861
    » Variety Achnanthes linearis var. linearis (W. Smith) Grunow in Cleve & Grunow, 1880 represented as Achnanthidium lineare W.Smith, 1855
    » Variety Achnanthes linearis var. pusilla (Grunow) Cleve, 1895 represented as Achnanthes pusilla Grunow in Cleve & Grunow, 1880
    » Variety Achnanthes linearis var. pusilla Grunow, 1880 accepted as Achnanthes pusilla Grunow in Cleve & Grunow, 1880
    » Forma Achnanthes linearis f. curta H.L.Smith ex Boyer, 1916 (uncertain, unassessed)
    » Forma Achnanthes linearis f. exilis Cleve-Euler, 1932 (uncertain, unassessed)
    » Forma Achnanthes linearis f. minuta Skvortzow, 1935 (uncertain, unassessed)
    » Variety Achnanthes linearis var. cryptocephala Sheshukova in Poretzky & Sheshukova, 1953 (uncertain, unassessed)
    » Variety Achnanthes linearis var. cryptocephala Sheshukova in Zabelina et al., 1951 (uncertain, unassessed)
    » Variety Achnanthes linearis var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes linearis var. kansouensis Skvortzow, 1935 (uncertain, unassessed)
    » Variety Achnanthes linearis var. nipponica Skvortzow, 1937 (uncertain, unassessed)
    » Variety Achnanthes linearis var. subcapitata Kolbe & Krieger, 1942 (uncertain, unassessed)
    » Variety Achnanthes linearis var. szechwanica Skvortzov, 2012 (uncertain)
  » Species Achnanthes linkei Hustedt, 1939 accepted as Planothidium linkei (Hustedt) Lange-Bertalot, 1999 (unaccepted)
    » Variety Achnanthes linkei var. rostrata Schulz, 1926 accepted as Achnanthes hauckiana var. rostrata Schulz ex Hustedt, 1930 (wrong species name)
    » Forma Achnanthes linkei f. minor Salah, 1955 (uncertain, unassessed)
    » Variety Achnanthes linkei var. linkei Hustedt, 1939 (uncertain, unassessed)
  » Species Achnanthes minuta (Cleve) Cleve-Euler, 1953 accepted as Achnanthidium minutum Cleve, 1891 (unaccepted)
  » Species Achnanthes modesta Manguin in Bourrelly & Manguin, 1954 accepted as Achnanthidium modestiforme (Lange-Bert.) Van de Vijver in Van de Vijver et al., 2002 (unaccepted)
  » Species Achnanthes modestiformis Lange-Bert. in Lange-Bertalot & Krammer, 1989 accepted as Achnanthidium modestiforme (Lange-Bert.) Van de Vijver in Van de Vijver et al., 2002 (unaccepted)
  » Species Achnanthes montana Krasske, 1929 accepted as Psammothidium montanum (Krasske) Mayuma, 2002 (unaccepted)
    » Variety Achnanthes montana var. conspicua Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes montana var. montana Krasske, 1929 (uncertain, unassessed)
    » Variety Achnanthes montana var. norvegica Hustedt, 1931 (uncertain, unassessed)
    » Variety Achnanthes montana var. sinica Skvortzov, 2012 (uncertain)
    » Variety Achnanthes montana var. tropica Hustedt, 1939 accepted as Platessa tropica (Hustedt, 1939) C.E.Wetzel, Tudesque & Le Cohu, 2016 (uncertain, unassessed)
  » Species Achnanthes parallela Carter, 1963 accepted as Achnanthes petersenii Hustedt, 1937 (unaccepted, synonym)
  » Species Achnanthes perpusilla (Østrup) Lange-Bertalot in Lange-Bertalot & Metzeltin, 1996 accepted as Psammothidium perpusillum (Østrup) Lange-Bertalot, 1999 (unaccepted, synonym)
  » Species Achnanthes pinnata Hustedt, 1922 accepted as Achnanthes conspicua A.Mayer, 1919 (unaccepted)
    » Forma Achnanthes pinnata f. robusta Moiseeva, 1959 (uncertain, unassessed)
    » Variety Achnanthes pinnata var. capensis Cholnoky, 1959 (uncertain, unassessed)
    » Variety Achnanthes pinnata var. japonica Hustedt, 1927 (uncertain, unassessed)
    » Variety Achnanthes pinnata var. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Variety Achnanthes pinnata var. pinnata Hustedt, 1922 (uncertain, unassessed)
  » Species Achnanthes pseudoconica Foged accepted as Achnanthes pseudoconspicua Foged, 1972 (unaccepted, misspelling)
  » Species Achnanthes pyrenaica Hustedt, 1939 accepted as Achnanthidium pyrenaicum (Hustedt) H.Kobayasi, 1997 (unaccepted, synonym)
    » Variety Achnanthes pyrenaica var. pyrenaica Hustedt, 1939 (uncertain, unassessed)
  » Species Achnanthes rupestris Krasske, 1932 accepted as Platessa rupestris (Krasske) Lange-Bertalot, 2004 (unaccepted, synonym)
    » Forma Achnanthes rupestris f. continua Cleve-Euler, 1953 (uncertain, unassessed)
    » Forma Achnanthes rupestris f. interrupta Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes rupestris var. rupestris Krasske, 1932 (uncertain, unassessed)
  » Species Achnanthes septentrionalis Østrup, 1910 accepted as Planothidium septentrionalis (Østrup) Round & Bukhtiyarova, 1996 (unaccepted, synonym)
  » Species Achnanthes subhudsonis Hustedt, 1921 accepted as Achnanthidium subhudsonis (Hustedt) H.Kobayasi, 2006 (unaccepted)
  » Species Achnanthes subsessilis Kützing, 1833 accepted as Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 (unaccepted)
    » Variety Achnanthes subsessilis var. angusta Cleve & Möller, 1878 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. constricta Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. cuneata Østrup in Tempère & Peragallo, 1912 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. enervis Petit, 1881 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. incurvata Østrup, 1895 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. inflata Proschkina-Lavrenko in Proschkina-Lavrenko & Roll, 1927 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. inflata Proschkina-Lavrenko & Roll, 1927 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. loczyi Pantocsek, 1889 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. multiarticulata P.L.Crouan & H.M.Crouan (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. multiarticulata Kützing, 1844 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. ovalis Dippol (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. subcrenulata Cleve, 1891 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. subsessilis Kützing, 1833 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. subventricosa Grunow in Schneider, 1878 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. subventricosa Grunow in Cleve & Möller, 1877 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. tumidula Grunow in Schneider, 1878 (uncertain, unassessed)
    » Variety Achnanthes subsessilis var. tumidula Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
  » Species Achnanthes suchlandtii Hustedt, 1933 accepted as Karayevia suchlandtii (Hustedt) Buktiyarova, 1999 (unaccepted)
    » Variety Achnanthes suchlandtii var. interrupta Carter, 1961 accepted as Achnanthes interrupta J.R.Carter, 1961 (wrong rank)
    » Variety Achnanthes suchlandtii var. montdorensis Manguin, 1954 (uncertain, unassessed)
    » Variety Achnanthes suchlandtii var. robusta Hustedt, 1959 (uncertain, unassessed)
    » Variety Achnanthes suchlandtii var. suchlandtii Hustedt, 1933 (uncertain, unassessed)
  » Species Achnanthes taeniata Grunow, 1880 accepted as Pauliella taeniata (Grunow) F.E.Round & P.W.Basson, 1997 (unaccepted)
  » Species Achnanthes tenuissima Hustedt, 1937 accepted as Nupela biconfusa (VanLandingham) C.E.Wetzel & Ector, 2018 (unaccepted, Illegitimate name.)
  » Species Achnanthes woltereckii Hustedt, 1942 accepted as Achnanthidium woltereckii (Hustedt) Lange-Bertalot, 1999 (unaccepted, synonym)
    » Variety Achnanthes woltereckii var. africana Cholnoky, 1959 (uncertain, unassessed)
    » Variety Achnanthes woltereckii var. swazilandica Cholnoky, 1962 (uncertain, unassessed)
    » Variety Achnanthes woltereckii var. wolterecki Hustedt, 1942 (uncertain, unassessed)
  » Species Achnanthes angustata Grev., 1859 (unassessed)
    » Forma Achnanthes angustata f. parva Cleve & J.D.Möller, 1878 (nomen nudum, No description)
  » Species Achnanthes bicapitata Hustedt, 1952 (nov. comb.)
  » Species Achnanthes bicapitellata Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes biceps Hustedt, 1959 (unassessed)
  » Species Achnanthes bigibba Heiden in Heiden & Kolbe, 1928 (unassessed)
  » Species Achnanthes bijuga Turpin, 1828 (unassessed)
  » Species Achnanthes bijugata Polenov, 1918 (unassessed)
  » Species Achnanthes bilunulata Turpin, 1828 (unassessed)
  » Species Achnanthes binodis Ehrenberg, 1854 (unassessed)
  » Species Achnanthes bioretii Germain, 1957 (unassessed)
  » Species Achnanthes birugula 'Hohn' VanLandingham, 1967 (unassessed)
  » Species Achnanthes bistriata Skvortzov, 1937 (unassessed)
  » Species Achnanthes blancheana R.Maillard ex Lange-Bertalot & A. Steindorf, 1995 (unassessed)
  » Species Achnanthes bonaeaurae Zanon, 1949 (unassessed)
  » Species Achnanthes borneolanceolata (ms.) Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes boudoui Metzeltin & Lange-Bertalot, 1998 (unassessed)
  » Species Achnanthes bourginii Manguin in Bourrelly & Manguin, 1955 (unassessed)
  » Species Achnanthes boyeri Mackay in L.W. Bailey, 1924 (unassessed)
  » Species Achnanthes brachypus Montague (unassessed)
  » Species Achnanthes brasiliensis Ehrenberg, 1854 (unassessed)
  » Species Achnanthes breenii R.E.M. Archibald, 1967 (unassessed)
  » Species Achnanthes bremeyeri Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes brevipes Kützing, 1833 (unassessed)
  » Species Achnanthes brevis Chernov, 1949 (unassessed)
  » Species Achnanthes breweri Foged, 1968 (unassessed)
  » Species Achnanthes brockmannii Hustedt, 1959 (unassessed)
  » Species Achnanthes broenlundensis Foged, 1955 (unassessed)
  » Species Achnanthes bruunii Foged, 1957 (unassessed)
  » Species Achnanthes buccula Cholnoky, 1966 (unassessed)
  » Species Achnanthes butterfassiana Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes calamae Frenguelli, 1930 (unassessed)
  » Species Achnanthes calcaroides Foged, 1971 (unassessed)
  » Species Achnanthes caledonica Lange-Bertalot, 1994 accepted as Achnanthidium caledonicum (Lange-Bertalot) Lange-Bertalot, 1999 (unassessed)
  » Species Achnanthes campechiana Hustedt, 1952 (unassessed)
  » Species Achnanthes campylopus Montagne, 1857 (unassessed)
  » Species Achnanthes capensis Kützing (unassessed)
    » Variety Achnanthes capensis var. capensis Kützing, 1844 (uncertain, unassessed)
    » Variety Achnanthes capensis var. multiarticulata Kützing, 1844 (uncertain, unassessed)
  » Species Achnanthes capitata Erlandsson, 1930 (unassessed)
  » Species Achnanthes capitatolineata (unassessed)
  » Species Achnanthes carissima Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes carmichaeli Greville in Hooker, 1833 (unassessed)
  » Species Achnanthes cassida Carter, 1970 (unassessed)
  » Species Achnanthes catenata Bily & Marvan, 1959 (unassessed)
  » Species Achnanthes centrafricana Fusey, 1964 (unassessed)
  » Species Achnanthes ceramii Hendey, 1977 (unassessed)
  » Species Achnanthes charcotii M. Peragallo, 1921 (unassessed)
  » Species Achnanthes chilensis Hustedt, 1927 † (unassessed)
    » Variety Achnanthes chilensis var. subaequalis Reimer, 1966 (uncertain, unassessed)
  » Species Achnanthes chinii Skvortzov, 2012
  » Species Achnanthes chlidanos M.H.Hohn & Hellerman, 1963 (unassessed)
  » Species Achnanthes cincta Andrews, 1971 (unassessed)
  » Species Achnanthes clara Cleve-Euler, 1948 (unassessed)
  » Species Achnanthes clavata Pantocsek, 1902 (unassessed)
  » Species Achnanthes cocconeiformis Mann, 1925 (unassessed)
  » Species Achnanthes cocconeioides Riznyk, 1973 (unassessed)
  » Species Achnanthes cochinchinensis M. Peragallo, 1897 (unassessed)
  » Species Achnanthes cogitata Archibald, 1971 (unassessed)
  » Species Achnanthes cognita Simonsen, 1987 (unassessed)
  » Species Achnanthes compacta Mann, 1925 (unassessed)
  » Species Achnanthes conchinchinensis ‘M. Peragallo' VanLandingham, 1967 (unassessed)
  » Species Achnanthes conspicuoides Foged, 1981 (unassessed)
  » Species Achnanthes contrarea Lange-Bertalot & A.Steindorf, 1995 (unassessed)
  » Species Achnanthes controversa Hustedt, 1937 (unassessed)
  » Species Achnanthes convergens H.Kobayasi ex H.Kobayshi, Nagumo & Mayama, 1986 (unassessed)
  » Species Achnanthes corrupta Giffen, 1984 (unassessed)
  » Species Achnanthes costata Greville, 1866 (unassessed)
  » Species Achnanthes costata Johnston, 1860 (unassessed)
  » Species Achnanthes cotteriensis Foged, 1978 (unassessed)
  » Species Achnanthes crassa Hustedt, 1937 (unassessed)
    » Variety Achnanthes crassa var. elliptica Suxena & Venkateswarlu, 1968 (uncertain, unassessed)
  » Species Achnanthes crenulata Grunow, 1880 (unassessed)
    » Variety Achnanthes crenulata var. arcuata Tsumura, 1956 (uncertain, unassessed)
    » Variety Achnanthes crenulata var. confusa VanLandingham, 1967 (uncertain, unassessed)
    » Variety Achnanthes crenulata var. constricta Hustedt, 1937 (uncertain, unassessed)
    » Variety Achnanthes crenulata var. crenulata Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes crenulata var. elliptica Gandhi, 1960 (uncertain, unassessed)
    » Variety Achnanthes crenulata var. linearis Gandhi, 1960 (uncertain, unassessed)
    » Variety Achnanthes crenulata var. linearis Meister, 1934 (uncertain, unassessed)
  » Species Achnanthes cristata Rabenhorst, 1853 (unassessed)
  » Species Achnanthes crosbyana Foged, 1979 (unassessed)
  » Species Achnanthes crucifera Ostrup (unassessed)
    » Variety Achnanthes crucifera var. capitata Cleve-Euler, 1934 (uncertain, unassessed)
    » Variety Achnanthes crucifera var. crucifera Østrup, 1910 (uncertain, unassessed)
    » Variety Achnanthes crucifera var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes crucifera var. pseudoexigua Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes cryophila (unassessed)
  » Species Achnanthes cryptocephala ‘Naegeli' Chase, 1907 (unassessed)
  » Species Achnanthes cucurbita Skvortzow, 1935 (unassessed)
  » Species Achnanthes cuneata Grunow in Cleve & Grunow as Achnanthes (seriata var.?) cuneata, 1880 (unassessed)
  » Species Achnanthes curtissima J.R.Carter, 1963 accepted as Psammothidium microscopicum (Cholnoky) S. Blanco, 2016 (unassessed)
  » Species Achnanthes curvata Leuduger-Fortmorel, 1879 (unassessed)
  » Species Achnanthes curvirostrum J.Brun, 1895 (unassessed)
  » Species Achnanthes cyclophora Heiden in Heiden & Kolbe, 1928 (unassessed)
  » Species Achnanthes dalaica Skvortzov, 2012
  » Species Achnanthes danica sensu Pantocsek, 1889 (unassessed)
  » Species Achnanthes danica (Flögel) Grunow in Cleve & Grunow, 1880 (unassessed)
    » Variety Achnanthes danica var. danica (Flögel) Grunow in Cleve & Grunow, 1880 represented as Cocconeis danica Flogel, 1873
    » Forma Achnanthes danica f. maxima Tempère & Peragallo, 1908 (uncertain, unassessed)
    » Variety Achnanthes danica var. asymmetrica Missuna, 1914 (uncertain, unassessed)
    » Variety Achnanthes danica var. major Cleve, 1895 (uncertain, unassessed)
    » Variety Achnanthes danica var. maxima Cleve in Schmidt et al., 1895 (uncertain, unassessed)
    » Variety Achnanthes danica var. schulzii Cleve-Euler, 1940 (uncertain, unassessed)
  » Species Achnanthes danicoides Giffen, 1975 (unassessed)
  » Species Achnanthes daonensis Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes daui Foged, 1962 (unassessed)
    » Variety Achnanthes daui var. alaskaensis Foged, 1971 (uncertain, unassessed)
  » Species Achnanthes debilissima Østrup, 1910 (unassessed)
  » Species Achnanthes decipiens Reimer, 1966 (unassessed)
  » Species Achnanthes deflexa C.W.Reimer, 1966 (unassessed)
    » Variety Achnanthes deflexa var. alpestris Lowe & Kociolek, 1984 (uncertain, unassessed)
  » Species Achnanthes delicatissima Simonsen, 1959 (unassessed)
  » Species Achnanthes delpiroui M. Peragallo in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes desperata Cholnoky, 1959 (unassessed)
  » Species Achnanthes detha Hohn & Hellerman, 1963 (unassessed)
  » Species Achnanthes devilensis N.Foged, 1981 (unassessed)
  » Species Achnanthes didyma Hustedt, 1933 (unassessed)
    » Forma Achnanthes didyma f. didyma Hustedt accepted as Achnanthes didyma Hustedt, 1933 (nominate variey)
    » Forma Achnanthes didyma f. gibbosa J.R.Carter, 1981 (uncertain, unassessed)
  » Species Achnanthes diluviana Hustedt, 1954 (unassessed)
  » Species Achnanthes dimorpha Turpin, 1828 (unassessed)
  » Species Achnanthes dimorphostriata H. Kobayashi, 1968 (unassessed)
  » Species Achnanthes diplopunctata Simonsen, 1959 (unassessed)
  » Species Achnanthes dispar Mann, 1907 (unassessed)
    » Variety Achnanthes dispar var. dispar Cleve, 1891 (uncertain, unassessed)
    » Variety Achnanthes dispar var. rumaniensis Hustedt in Schmidt et al., 1936 (uncertain, unassessed)
    » Variety Achnanthes dispar var. rumaniensis Hustedt ex Simonsen, 1987 (uncertain, unassessed)
    » Variety Achnanthes dispar var. typica Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes distincta Messikommer, 1954 (unassessed)
  » Species Achnanthes distorta M. Peragallo, 1921 (unassessed)
  » Species Achnanthes divergens A.Cleve, 1953 (unassessed)
  » Species Achnanthes diversa Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes dornii Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes dorogostaiskii Jasnitsky, 1936 (unassessed)
  » Species Achnanthes dubia Bory, 1822 (unassessed)
  » Species Achnanthes duthiei Sreenivasa, 1971 † (unassessed)
  » Species Achnanthes elegans H. Kobayashi, 1965 (unassessed)
  » Species Achnanthes elliptica Skvortzow & Meyer, 1928 (unassessed)
  » Species Achnanthes elliptica Kustner, 1914 (unassessed)
  » Species Achnanthes elliptica Schumann, 1867 (unassessed)
  » Species Achnanthes entrancensis Foged, 1978 (unassessed)
  » Species Achnanthes erdmannensis Foged, 1964 (unassessed)
  » Species Achnanthes eutrophila Lange-Bertalot, 1996 (unassessed)
  » Species Achnanthes exiguiformis Hustedt, 1948 (unassessed)
  » Species Achnanthes exiguoides Compère, 1967 (unassessed)
  » Species Achnanthes exilis sensu W. Smith, 1856 (unassessed)
    » Variety Achnanthes exilis var. exilis Brébisson (uncertain, unassessed)
    » Variety Achnanthes exilis var. exilis Kützing, 1833 (uncertain, unassessed)
    » Variety Achnanthes exilis var. tabellaria Petit & Leuduger (uncertain, unassessed)
  » Species Achnanthes exiloides Cholnoky, 1963 (unassessed)
  » Species Achnanthes exiloides Carter in Carter & Bailey-Watts, 1981 (unassessed)
  » Species Achnanthes expecta VanLandingham, 1967 (unassessed)
  » Species Achnanthes fasciata Gandhi, 1970 (unassessed)
  » Species Achnanthes felinophila R.L.Lowe & A.R.Sherwood, 2009 (unassessed)
  » Species Achnanthes flahaulti Héribaud, 1903 (unassessed)
  » Species Achnanthes flathukensis Foged, 1964 (unassessed)
  » Species Achnanthes fogedii Håkansson, 1978 (unassessed)
  » Species Achnanthes follioti Fusey, 1950 (unassessed)
  » Species Achnanthes fontana Round, 1959 (unassessed)
  » Species Achnanthes fonticola Hustedt, 1945 (unassessed)
  » Species Achnanthes fonticolanceolata Lange-Bertalot & Schimanski, 1989 (unassessed)
  » Species Achnanthes formosa Preobrazhebskaya, 1960 (unassessed)
  » Species Achnanthes fossilis M. Peragallo in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes fragilarioides J.B.Petersen, 1924 (unassessed)
  » Species Achnanthes fragilis Skvortzow, 1938 (unassessed)
  » Species Achnanthes fraudulenta Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes fredskildii Foged, 1977 (unassessed)
  » Species Achnanthes frequentissima Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes frigida Hustedt, 1937 (unassessed)
  » Species Achnanthes frigida Cleve-Euler, 1939 (unassessed)
  » Species Achnanthes fugeii Carter, 1963 (unassessed)
  » Species Achnanthes fugiens Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes fukiensis Skvortzow, 1929 (unassessed)
  » Species Achnanthes fulla J.R.Carter, 1970 (unassessed)
  » Species Achnanthes genuflexa Kützing, 1844 (unassessed)
  » Species Achnanthes georgica Reinsch, 1890 (unassessed)
  » Species Achnanthes germainii Manguin in Bourrelly & Manguin, 1954 (unassessed)
  » Species Achnanthes gessneri Hustedt, 1953 (unassessed)
  » Species Achnanthes gibbosa Hustedt, 1939 (unassessed)
  » Species Achnanthes girinensis Skvortzow, 1935 (unassessed)
  » Species Achnanthes gondwana D. Metzeltin & H. Lange-Bertalot, 2002 (unassessed)
  » Species Achnanthes gracillima (Meister) Mills, 1933 (unassessed)
  » Species Achnanthes gracillima Hustedt, 1927 (unassessed)
    » Variety Achnanthes gracillima var. gracillima Hustedt, 1927 (uncertain, unassessed)
    » Variety Achnanthes gracillima var. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Variety Achnanthes gracillima var. sinica Skvortzov, 2012 (uncertain)
  » Species Achnanthes grana Hohn & Hellerman, 1963 (unassessed)
  » Species Achnanthes gregoriana Greville, 1859 (unassessed)
  » Species Achnanthes grischuna Wuthrich, 1975 (unassessed)
  » Species Achnanthes groenlandica (Cleve) Grunow, 1880 (unassessed)
    » Variety Achnanthes groenlandica var. groenlandica (Cleve) Grunow in Cleve & Grunow, 1880 represented as Achnanthidium groenlandicum Cleve, 1873
    » Forma Achnanthes groenlandica f. jaydei McIntire (uncertain, unassessed)
    » Forma Achnanthes groenlandica f. meridiana Giffen, 1973 (uncertain, unassessed)
    » Variety Achnanthes groenlandica var. clevei Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes groenlandica var. oestrupii Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes groenlandica var. oestrupii Cleve-Euler ex VanLandingham, 1967 (uncertain, unassessed)
    » Variety Achnanthes groenlandica var. phinneyi McIntire & Reimer, 1974 (uncertain, unassessed)
  » Species Achnanthes grubei Simonsen, 1987 (unassessed)
  » Species Achnanthes grunowii Toyoda & D.M.Williams, 2005 (unassessed)
  » Species Achnanthes hallandica A.Cleve, 1953 (unassessed)
  » Species Achnanthes hankensis Skvortzow, 1929 (unassessed)
  » Species Achnanthes hantzschiana Volkov, 1940 (unassessed)
  » Species Achnanthes hardingensis Foged, 1981 (unassessed)
  » Species Achnanthes harrisonii Cholnoky, 1959 (unassessed)
  » Species Achnanthes harveyi Reimer, 1966 (unassessed)
  » Species Achnanthes hastata Skvortzow & Meyer, 1928 accepted as Achnanthes subhastata (Skvortzov) (unassessed)
  » Species Achnanthes hauckiana Grunow, 1880 (unassessed)
    » Forma Achnanthes hauckiana f. fossilis Manguin, 1952 (uncertain, unassessed)
    » Forma Achnanthes hauckiana f. lancettula Hustedt, 1937 (uncertain, unassessed)
    » Forma Achnanthes hauckiana f. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Forma Achnanthes hauckiana f. rhombica Cleve-Euler, 1949 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. densistriata Horikawa & Okuno in Okuno, 1940 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. elliptica Schulz, 1926 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. elliptica Schulz ex Hustedt, 1930 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. hauckiana Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. jonesii Petersen, 1935 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. nipponica Skvortzow, 1936 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. rhombica Zabelina, 1939 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. rostrata Schulz, 1926 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. rostrata Schulz ex Hustedt, 1930 (uncertain, unassessed)
    » Variety Achnanthes hauckiana var. subrhombica Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes hauckii Grunow in Van Heurck, 1880 (unassessed)
  » Species Achnanthes haynaldii Schaarschmidt, 1881 (unassessed)
    » Variety Achnanthes haynaldii var. haynaldii Schaarschmidt, 1881 represented as Planothidium haynaldii (Schaarschmidt) Lange-Bertalot, 1999
    » Variety Achnanthes haynaldii var. linkei (Hustedt) Cleve-Euler, 1953 represented as Achnanthes linkei var. linkei Hustedt, 1939
    » Variety Achnanthes haynaldii var. borussica Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes haynaldii var. elliptica-lanceolata Schaarschmidt, 1881 (uncertain, unassessed)
    » Variety Achnanthes haynaldii var. intermedia Cleve-Euler in Florin, 1944 (uncertain, unassessed)
    » Variety Achnanthes haynaldii var. oblongo-elliptica Schaarschmidt, 1881 (uncertain, unassessed)
    » Variety Achnanthes haynaldii var. semiaperta Cleve-Euler in Florin, 1944 (uncertain, unassessed)
    » Variety Achnanthes haynaldii var. vulgaris Schaarschmidt, 1881 (uncertain, unassessed)
  » Species Achnanthes hedini Hustedt, 1922 (unassessed)
  » Species Achnanthes heideni (unassessed)
    » Variety Achnanthes heideni var. aapaensis Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes heideni var. gothica Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes heideni var. heideni Schulz, 1926 (uncertain, unassessed)
    » Variety Achnanthes heideni var. typica Cleve-Euler, 1953 (uncertain, unassessed)
  » Species Achnanthes herteri Frenguelli, 1933 (unassessed)
  » Species Achnanthes heteropsis Grunow ex Cleve & Möller, 1878 (unassessed)
  » Species Achnanthes heterostriata Hustedt, 1952 (unassessed)
  » Species Achnanthes heterostriatoides Hohn in Patrick et al., 1966 (unassessed)
  » Species Achnanthes hettensis Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes hexagona Cleve & Brun in Brun, 1891 (unassessed)
  » Species Achnanthes hilliardii Manguin, 1961 (unassessed)
  » Species Achnanthes himalayensis Jao & Zhu in Jao, Zhu & Lee, 1974 (unassessed)
  » Species Achnanthes hintzii Lange-Bertalot & Krammer, 1989 (unassessed)
  » Species Achnanthes hirta Carter, 1970 (unassessed)
  » Species Achnanthes hoermannii Gutwinski, 1899 (unassessed)
  » Species Achnanthes holmquistii Foged, 1968 (unassessed)
  » Species Achnanthes holsatica Hustedt, 1936 (unassessed)
  » Species Achnanthes hormanii Gutwinski, 1899 (unassessed)
  » Species Achnanthes hudsonis Grunow, 1880 (unassessed)
  » Species Achnanthes hustedtii Bily & Marvan, 1959 (unassessed)
  » Species Achnanthes hyperborea (Grunow) Grunow, 1884 (unassessed)
  » Species Achnanthes hyperboreoides A.Witkowski, D.Metzeltin & Lange-Bertalot, 1996 (unassessed)
  » Species Achnanthes ignota Hustedt, 1958 (unassessed)
  » Species Achnanthes Imanishii Hirano, 1963 (unassessed)
  » Species Achnanthes imperfecta Schimanski, 1978 (unassessed)
  » Species Achnanthes impexa Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes impexiformis Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes inaequalis Ehrenberg, 1838 (unassessed)
  » Species Achnanthes incognita Krasske, 1939 (unassessed)
  » Species Achnanthes incrassata Ehrenberg, 1854 (unassessed)
  » Species Achnanthes indica Brun, 1893 (unassessed)
    » Variety Achnanthes indica var. indica Ehrenberg, 1854 (uncertain, unassessed)
    » Variety Achnanthes indica var. sulcata M. Peragallo in H. Peragallo & M. Peragallo, 1911 (uncertain, unassessed)
  » Species Achnanthes indicatrix Lange-Bertalot & A.Steindorf, 1998 (unassessed)
  » Species Achnanthes indicta Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes inflatagrandis D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005 (unassessed)
  » Species Achnanthes ingratiformis Lange Bertalot, 1989 (unassessed)
  » Species Achnanthes inopinata Cleve (unassessed)
    » Forma Achnanthes inopinata f. amaculata Schljapina (uncertain, unassessed)
    » Forma Achnanthes inopinata f. lanceolata Schljapina (uncertain, unassessed)
    » Variety Achnanthes inopinata var. elliptica Schljapina, 1927 (uncertain, unassessed)
    » Variety Achnanthes inopinata var. elliptica Tempère & Peragallo, 1909 (uncertain, unassessed)
    » Variety Achnanthes inopinata var. inopinata Cleve, 1893 (uncertain, unassessed)
  » Species Achnanthes intermedia Kützing, 1833 (unassessed)
  » Species Achnanthes interrupta J.R.Carter, 1961 (unassessed)
  » Species Achnanthes investiens Carter, 1966 (unassessed)
  » Species Achnanthes iranensis Moghadam, 1976 (unassessed)
  » Species Achnanthes islandica Østrup, 1918 (unassessed)
  » Species Achnanthes iversenii Foged, 1977 (unassessed)
  » Species Achnanthes jacksonii Woodhead & Tweed, 1960 (unassessed)
  » Species Achnanthes jacobii Manguin, 1949 (unassessed)
  » Species Achnanthes jakovljevici Hustedt, 1945 (unassessed)
  » Species Achnanthes jamaicense Podzorski, 1985 (unassessed)
  » Species Achnanthes jamalinensis Grunow in Cleve & Grunow, 1880 (unassessed)
  » Species Achnanthes jan-marcinii Witkowski, Metzeltin & Lange-Bertalot, 1996 (unassessed)
  » Species Achnanthes japonica Kobayasi, 1965 (unassessed)
  » Species Achnanthes japonica Kobayasi ex Kobayasi, Nagumo & Mayama, 1986 (unassessed)
  » Species Achnanthes javanica Ehrenberg, 1854 (unassessed)
    » Variety Achnanthes javanica var. javanica Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
  » Species Achnanthes javanica Grunow in Cleve & Möller, 1878 (unassessed)
  » Species Achnanthes jeniseyensis Skvortzow, 1971 (unassessed)
    » Variety Achnanthes jeniseyensis var. undulata Skvortzow, 1971 (uncertain, unassessed)
  » Species Achnanthes jogensis Gandhi, 1966 (unassessed)
  » Species Achnanthes johncarteri Lange-Bertalot & Krammer, 1989 (unassessed)
  » Species Achnanthes joursacense Héribaud-Joseph, 1903 (unassessed)
  » Species Achnanthes juriljii VanLandingham, 1967 (unassessed)
  » Species Achnanthes kamczatica E.G.Lupikina, 1965 † (unassessed)
  » Species Achnanthes kansouensis Skvortzow, 1935 (unassessed)
  » Species Achnanthes karelica Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes karelica Mölder, 1951 (unassessed)
  » Species Achnanthes kenaiensis Stone in McLaughlin & Stone, 1986 (unassessed)
  » Species Achnanthes kenyae Cholnoky, 1960 (unassessed)
  » Species Achnanthes kerguelenensis Castracane, 1886 (unassessed)
  » Species Achnanthes Kertschiana Pantocsek, 1902 (unassessed)
  » Species Achnanthes kisselevi Vladimirova, 1947 (unassessed)
  » Species Achnanthes kizaki Skvortzow, 1936 (unassessed)
  » Species Achnanthes koenigii Simonsen, 1959 (unassessed)
  » Species Achnanthes koghisensis G.Moser, Lange-Bertalot & D.Metzeltin, 1998 (unassessed)
  » Species Achnanthes koreana Skvortzow, 1936 (unassessed)
  » Species Achnanthes koshovii Jasnitsky, 1936 (unassessed)
  » Species Achnanthes kranzii Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes krasskei Kobayasi & Sawatari, 1986 (unassessed)
  » Species Achnanthes krejcii Hustedt, 1950 (unassessed)
  » Species Achnanthes krejcii Hustedt in Schmidt et al., 1937 accepted as Platessa krejcii (Hustedt, 1937) C.E.Wetzel, Tudesque & Le Cohu, 2016 (unassessed)
  » Species Achnanthes kryophiloides Foged, 1964 (unassessed)
  » Species Achnanthes kryophiloides Hohn, 1966 (unassessed)
  » Species Achnanthes kuelbsii Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes kuolensis Cleve-Euler, 1934 (unassessed)
  » Species Achnanthes kuwaitensis Hendey, 1958 (unassessed)
  » Species Achnanthes lacunicola Patrick & Freese, 1961 (unassessed)
  » Species Achnanthes lacus-karluki E.Manguin ex Kociolek & Reviers, 1996 (unassessed)
  » Species Achnanthes lacus-vulcani Lange-Bertalot & Krammer, 1989 (unassessed)
  » Species Achnanthes laevis Østrup, 1910 (unassessed)
  » Species Achnanthes lakus-baikali Skvortzow, 1937 (unassessed)
  » Species Achnanthes lanceolata Lange-Bertalot in Krammer & Lange-Bertalot in H. Ettl et al., 1991 (unassessed)
  » Species Achnanthes lanceolata Lange-Bertalot, 1993 (unassessed)
  » Species Achnanthes lanceolata Skabichevskii, 1987 (unassessed)
  » Species Achnanthes lanceolatoides H.E.Sovereign, 1958 (unassessed)
  » Species Achnanthes lancettula Østrup in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes lancettula Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes lapeyrerei Tempère & M. Peragallo in Tempère & Peragallo, 1908 (unassessed)
  » Species Achnanthes laportei Manguin, 1954 (unassessed)
  » Species Achnanthes larsenii Foged, 1968 (unassessed)
  » Species Achnanthes lata Hustedt, 1942 (unassessed)
  » Species Achnanthes laterostrata Hustedt, 1933 (unassessed)
    » Forma Achnanthes laterostrata f. krasske Foged, 1952 (uncertain, unassessed)
    » Variety Achnanthes laterostrata var. capitata Stone in McLaughlin & Stone, 1986 (uncertain, unassessed)
    » Variety Achnanthes laterostrata var. lanceolata Krasske, 1943 (uncertain, unassessed)
  » Species Achnanthes latestriata Riznyk, 1973 (unassessed)
  » Species Achnanthes latissima Cleve-Euler, 1915 (unassessed)
  » Species Achnanthes lauenburgiana Hustedt, 1950 (unassessed)
  » Species Achnanthes lecohui Coste & Ricard, 1982 (unassessed)
  » Species Achnanthes leibleinii Agardh, 1832 (unassessed)
  » Species Achnanthes leonardii Witkowski & Lange-Bertalot, 2000 (unassessed)
  » Species Achnanthes leontopithecus-rosalia J.C.F. da Costa, 1995 (unassessed)
  » Species Achnanthes lesothensis Schoeman, 1973 (unassessed)
  » Species Achnanthes leudugeri Tempère & Brun in Brun & Tempère, 1889 (unassessed)
  » Species Achnanthes leveillei Héribaud in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes lewisiana R.M.Patrick, 1945 (unassessed)
  » Species Achnanthes ligeriana Héribaud, 1903 (unassessed)
  » Species Achnanthes lilljeborgii Grunow, 1881 (unassessed)
  » Species Achnanthes lineariformis H. Kobayashi, 1965 (unassessed)
  » Species Achnanthes lineariformis H. Kobayashi, 1964 (unassessed)
  » Species Achnanthes lineariformis Lange-Bertalot, 1993 (unassessed)
  » Species Achnanthes linearioides Lange-Bertalot in Lange-Bertalot & Moser, 1994 (unassessed)
  » Species Achnanthes lintonensis J.R.Carter, 1961 (unassessed)
  » Species Achnanthes loczyi Pantocsek, 1889 (unassessed)
  » Species Achnanthes longboardia A.R.Sherwood & R.L.Lowe, 2009 (unassessed)
  » Species Achnanthes lucana Carter, 1970 (unassessed)
  » Species Achnanthes lutheri Hustedt, 1933 (unassessed)
  » Species Achnanthes lyrata Proschkina-Lavrenko, 1961 (unassessed)
  » Species Achnanthes lyroides König, 1959 (unassessed)
  » Species Achnanthes maceneryae Reimer & Lee, 1988 (unassessed)
  » Species Achnanthes macquariensis Foged, 1978 (unassessed)
  » Species Achnanthes macropus Kützing in lit. in Kützing, 1844 (unassessed)
  » Species Achnanthes maculata Hustedt, 1937 (unassessed)
  » Species Achnanthes maewensis Foged, 1972 (unassessed)
  » Species Achnanthes magnifica Hustedt, 1952 (unassessed)
  » Species Achnanthes mamchyi Skvortzow, 1975 (unassessed)
  » Species Achnanthes mammalis (Castracane) Cleve (unassessed)
  » Species Achnanthes manifera Brun, 1895 (unassessed)
  » Species Achnanthes mannii ‘Pantocsek' VanLandingham, 1979 (unassessed)
  » Species Achnanthes mansiensis Foged, 1966 (unassessed)
  » Species Achnanthes maranda N.Woodhead & R.D.Tweed, 1958 (unassessed)
  » Species Achnanthes margaritaceum Cleve, 1893 (unassessed)
  » Species Achnanthes margaritarum Cleve, 1893 (unassessed)
  » Species Achnanthes marginalis Hendey, 1958 (unassessed)
  » Species Achnanthes marginestriata Simonsen, 1959 (unassessed)
  » Species Achnanthes marina Hustedt, 1937 (unassessed)
  » Species Achnanthes marraitensis Foged, 1958 (unassessed)
  » Species Achnanthes martyi Héribaud in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes mauiensis R.L.Lowe & A.R.Sherwood, 2009 (unassessed)
  » Species Achnanthes meisteri Hustedt ex R.Simonsen, 1987 (unassessed)
  » Species Achnanthes mercuryi Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996 (unassessed)
  » Species Achnanthes mesogongyla Grunow in Cleve & Grunow, 1880 (unassessed)
  » Species Achnanthes metaffinis Lange-Bertalot & A.Steindorf, 1995 (unassessed)
  » Species Achnanthes metakryophila Lange-Bertalot & Schmidt, 1990 (unassessed)
  » Species Achnanthes meyeri Skvortzow, 1937 (unassessed)
  » Species Achnanthes mica Hohn in Patrick et al., 1966 (unassessed)
  » Species Achnanthes minima J.R.Carter, 1961 (unassessed)
  » Species Achnanthes minuscula Hustedt, 1945 (unassessed)
  » Species Achnanthes minutissima Kützing, 1833 (unassessed)
    » Variety Achnanthes minutissima var. minutissima Krasske, 1938
    » Forma Achnanthes minutissima f. gracillima (Meister) Cleve-Euler, 1932 represented as Microneis gracillima Meister, 1912
    » Forma Achnanthes minutissima f. inconspicua (Østrup) Cleve-Euler, 1932 represented as Achnanthes minutissima var. inconspicua Østrup, 1910
    » Variety Achnanthes minutissima var. affinis (Grunow) Lange-Bertalot, 1989 represented as Achnanthes affinis Grunow, 1880
    » Variety Achnanthes minutissima var. gracillima (Meister) Lange-Bertalot, 1989 represented as Microneis gracillima Meister, 1912
    » Variety Achnanthes minutissima var. jackii (Rabenhorst) Lange-Bertalot & Ruppel, 1980 represented as Achnanthidium jackii Rabenhorst, 1861
    » Variety Achnanthes minutissima var. pyrenaica (Hustedt) Cleve-Euler, 1953 represented as Achnanthes pyrenaica var. pyrenaica Hustedt, 1939
    » Variety Achnanthes minutissima var. scotica (Carter) Lange-Bertalot, 1989 represented as Achnanthes microcephala f. scotica J.R.Carter, 1981
    » Forma Achnanthes minutissima f. curta Grunow, 1880 (uncertain, unassessed)
    » Forma Achnanthes minutissima f. curta Gutwinski, 1895 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. ambigua Palamar, 1956 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. amphicephala Korshikov, 1941 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. bistriata Skvortzov, 2012 (uncertain)
    » Variety Achnanthes minutissima var. capitata Skvortzow & Noda, 1971 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. constricta Skvortzow, 1935 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. cryptocephala Grunow, 1880 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. exilissima Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. genuina Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. inconspicua Østrup, 1910 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. macrocephala Hustedt, 1937 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. microcephala Mukhamediev, 1957 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. minutissima Kützing, 1833 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. robusta Hustedt, 1937 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. saprophila H.Kobayasi & Mayama, 1982 (uncertain, unassessed)
    » Variety Achnanthes minutissima var. subrobusta Maillard, 1978 (uncertain, unassessed)
  » Species Achnanthes miocaenica Moiseeva, 1959 (unassessed)
  » Species Achnanthes miota Carter & Denny, 1982 (unassessed)
  » Species Achnanthes mirabilis Proschkina-Lavrenko, 1955 (unassessed)
  » Species Achnanthes misionera Frenguelli, 1953 (unassessed)
  » Species Achnanthes modica Hustedt, 1952 (unassessed)
  » Species Achnanthes mollis Krasske, 1939 (unassessed)
  » Species Achnanthes monela Hohn & Hellerman, 1963 (unassessed)
  » Species Achnanthes montdorensis Manguin, 1954 (unassessed)
  » Species Achnanthes muelleri ‘Pantocsek' VanLandingham, 1979 (unassessed)
  » Species Achnanthes muelleri Carlson, 1913 (unassessed)
  » Species Achnanthes multiarticulata Agardh, 1832 (unassessed)
  » Species Achnanthes nagpurensis Sarode & Kamat, 1984 (unassessed)
  » Species Achnanthes namae Giffen, 1984 (unassessed)
  » Species Achnanthes nana Meister, 1934 (unassessed)
  » Species Achnanthes nathorsti Brun, 1901 (unassessed)
  » Species Achnanthes natrata Carter, 1966 (unassessed)
  » Species Achnanthes navalis Giffen, 1976 (unassessed)
  » Species Achnanthes naviformis Van de Vijver & Beyens in Van de Vijver et al., 2002 (unassessed)
  » Species Achnanthes neglecta Chi & Ruowen (unassessed)
  » Species Achnanthes neocaledonica Manguin ex Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995 (unassessed)
  » Species Achnanthes neocaledonica Manguin, 1962 (unassessed)
  » Species Achnanthes neocaledonica Manguin ex Kociolek & Reviers, 1996 (unassessed)
  » Species Achnanthes neohustedtii VanLandingham, 1979 (unassessed)
  » Species Achnanthes neokisselevii VanLandingham, 1969 (unassessed)
  » Species Achnanthes neoskvortzowii Simonsen, 1987 (unassessed)
  » Species Achnanthes nikiskii Stone in McLaughlin & Stone, 1986 (unassessed)
  » Species Achnanthes ninckei P.Guermeur & E.Manguin, 1953 (unassessed)
  » Species Achnanthes nitida Cleve-Euler, 1939 (unassessed)
  » Species Achnanthes nitidiformis Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes nivellis Fusey, 1953 (unassessed)
  » Species Achnanthes nobile Schulz, 1926 (unassessed)
  » Species Achnanthes nodeana Skvortzow in Skvortzow & Noda, 1971 (unassessed)
  » Species Achnanthes nodosa Cleve, 1900 (unassessed)
  » Species Achnanthes nollii O. & W.Bock, 1953 (unassessed)
  » Species Achnanthes normanii (unassessed)
    » Variety Achnanthes normanii var. undulata ‘Krasske' VanLandingham, 1929 (uncertain, unassessed)
  » Species Achnanthes obliqua Turpin, 1828 (unassessed)
  » Species Achnanthes oblonga E.Manguin ex Kociolek & Reviers, 1996 (unassessed)
  » Species Achnanthes oblongella Østrup, 1902 (unassessed)
  » Species Achnanthes obtusa Ehrenberg in Ralfs in Pritchard, 1861 (unassessed)
  » Species Achnanthes occulta Kalbe, 1963 (unassessed)
  » Species Achnanthes ocellata Manguin, 1952 (unassessed)
  » Species Achnanthes octalterna Turpin, 1828 (unassessed)
  » Species Achnanthes oculata Hustedt (unassessed)
    » Forma Achnanthes oculata f. rostrata Hustedt, 1952 (uncertain, unassessed)
    » Variety Achnanthes oculata var. oculata Hustedt, 1952 (uncertain, unassessed)
  » Species Achnanthes oerensis Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes okamurae Skvortzow, 1937 (unassessed)
  » Species Achnanthes oregonensis Riznyk, 1973 (unassessed)
  » Species Achnanthes orellana Hohn in Patrick et al., 1966 (unassessed)
  » Species Achnanthes orientalis Hustedt, 1933 (unassessed)
  » Species Achnanthes orientalis Meister, 1937 (unassessed)
  » Species Achnanthes orientalis Petit, 1904 (unassessed)
  » Species Achnanthes ostrupii (unassessed)
  » Species Achnanthes pachypus Montagne, 1838 (unassessed)
  » Species Achnanthes pachypus Montagne, 1839 (unassessed)
  » Species Achnanthes pagesi M. Peragallo in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes paIustris P.Fusey (unassessed)
  » Species Achnanthes palustris (unassessed)
    » Variety Achnanthes palustris var. ovalis Fusey, 1948 (uncertain, unassessed)
    » Variety Achnanthes palustris var. palustris Fusey, 1948 (uncertain, unassessed)
  » Species Achnanthes pamirensis Hustedt, 1922 (unassessed)
  » Species Achnanthes pantocseki Hajós, 1968 (unassessed)
  » Species Achnanthes papillosa Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes paradoxa Ehrenberg, 1845 (unassessed)
  » Species Achnanthes parallela Castracane, 1886 (unassessed)
  » Species Achnanthes parexigua D.Metzeltin & Lange-Bertalot, 1998 (unassessed)
  » Species Achnanthes parvula Kützing, 1844 (unassessed)
  » Species Achnanthes parvula Kützing, 1836 (unassessed)
  » Species Achnanthes pelta Hohn & Hellerman, 1966 (unassessed)
  » Species Achnanthes pennaeformis Greville, 1866 (unassessed)
  » Species Achnanthes pennata Greville in Cleve, 1883 (unassessed)
  » Species Achnanthes peragalloi Brun & Héribaud-Joseph, 1893 (unassessed)
  » Species Achnanthes perfida J.R.Carter, 1963 (unassessed)
  » Species Achnanthes pericava J.R.Carter, 1966 (unassessed)
  » Species Achnanthes peridotitica Moser, Lange-Bertalot & Metzeltin, 1998 (unassessed)
  » Species Achnanthes perminuta Østrup, 1913 (unassessed)
  » Species Achnanthes perpusilla (Østrup) Lange-Bertalot in Lange-Bertalot & Moser, 1994 (unassessed)
  » Species Achnanthes perturba VanLandingham, 1967 (unassessed)
  » Species Achnanthes petiti Aleem, 1954 (unassessed)
  » Species Achnanthes philippinica Skvortzow, 1937 (unassessed)
  » Species Achnanthes piafica Carter & Denny, 1982 (unassessed)
  » Species Achnanthes pictii J.R.Carter, 1963 (unassessed)
  » Species Achnanthes pirogueana R.Maillard, 1978 (unassessed)
  » Species Achnanthes pitoti (unassessed)
    » Forma Achnanthes pitoti f. capitata Guermeur, 1954 (uncertain, unassessed)
    » Forma Achnanthes pitoti f. mesolepta Guermeur, 1954 (uncertain, unassessed)
    » Forma Achnanthes pitoti f. undulata Guermeur, 1954 (uncertain, unassessed)
    » Variety Achnanthes pitoti var. pitoti Guermeur, 1954 (uncertain, unassessed)
  » Species Achnanthes plana J.R.Carter, 1963 (unassessed)
  » Species Achnanthes pletei (misspelling)
  » Species Achnanthes plitvicensis Hustedt, 1945 (unassessed)
  » Species Achnanthes ploenensis Hustedt, 1930 (unassessed)
  » Species Achnanthes ploenensis sensu Poretzky, 1933 (unassessed)
  » Species Achnanthes polaris Oestrup, 1895 (unassessed)
  » Species Achnanthes polynesica H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (unassessed)
  » Species Achnanthes portae Cholnoky, 1959 (unassessed)
  » Species Achnanthes praecipua E.Reichardt, 1988 (unassessed)
  » Species Achnanthes prava Sovereign, 1963 (unassessed)
  » Species Achnanthes procera Hustedt, 1945 (unassessed)
  » Species Achnanthes profunda Skvortzov, 1937 (unassessed)
  » Species Achnanthes promunturii Giffen, 1970 (unassessed)
  » Species Achnanthes pseudincognita Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes pseudoaffinis Maillard, 1978 (unassessed)
    » Variety Achnanthes pseudoaffinis var. capitata R.Maillard, 1978 (uncertain, unassessed)
  » Species Achnanthes pseudo-antiqua M. Peragallo in Héribaud et al., 1920 (unassessed)
  » Species Achnanthes pseudobiasolletiana Gandhi, 1961 (unassessed)
  » Species Achnanthes pseudobiceps H.Håkansson, 1974 (unassessed)
  » Species Achnanthes pseudobliqua Simonsen, 1960 (unassessed)
  » Species Achnanthes pseudoconspicua Foged, 1972 (unassessed)
  » Species Achnanthes pseudoexigua Loseva, 1982 (unassessed)
  » Species Achnanthes pseudoexigua Skvortzov, 2012
  » Species Achnanthes pseudogrimmei Cholnoky, 1970 (unassessed)
  » Species Achnanthes pseudogroenlandica Hendey, 1964 (unassessed)
  » Species Achnanthes pseudohexagona Hustedt, 1952 (unassessed)
  » Species Achnanthes pseudohungarica Cholnoky-Pfannkuche, 1966 (unassessed)
  » Species Achnanthes pseudohustedtii Kobayasi in Ando, Haraguchi & Kobayasi, 1971 (unassessed)
  » Species Achnanthes pseudolanceolata Hustedt, 1952 (unassessed)
  » Species Achnanthes pseudolanceolata Manguin, 1962 (unassessed)
  » Species Achnanthes pseudolinearis Hustedt, 1942 (unassessed)
  » Species Achnanthes pseudolongipes K.Toyoda & T.Nagumo, 2010 (unassessed)
  » Species Achnanthes pseudo-obliqua Kobayasi in Ando, Haraguchi & Kobayasi, 1971 (unassessed)
  » Species Achnanthes pseudopinnata Foged, 1972 (unassessed)
  » Species Achnanthes pseudopunctulata Simonsen, 1959 (unassessed)
  » Species Achnanthes pseudoscutiformis Loseva, 1982 (unassessed)
  » Species Achnanthes pseudoseminulum Cleve-Euler, 1934 (unassessed)
  » Species Achnanthes pseudosolea Simonsen, 1959 (unassessed)
  » Species Achnanthes pseudosuchlandtii Manguin, 1961 (unassessed)
  » Species Achnanthes pseudoswazi J.R.Carter, 1963 (unassessed)
  » Species Achnanthes pseudotanensis A.Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes pulchella Heiden in Heiden & Kolbe, 1928 (unassessed)
  » Species Achnanthes pulcherrima (Hustedt) Metzeltin & Lange-Bertalot, 1998 (unassessed)
  » Species Achnanthes pulviscula Cholnoky, 1960 (unassessed)
  » Species Achnanthes punctata Round, 1959 (unassessed)
  » Species Achnanthes punctifera Hustedt, 1955 (unassessed)
  » Species Achnanthes punctulata Simonsen, 1959 (unassessed)
  » Species Achnanthes pusilla Woodhead & Tweed, 1960 (unassessed)
  » Species Achnanthes pusilla Grunow in Cleve & Möller, 1879 (unassessed)
  » Species Achnanthes pusilla Grunow in Van Heurck, 1880 (unassessed)
  » Species Achnanthes pyropa Carter, 1970 (unassessed)
  » Species Achnanthes quadralterna Turpin, 1828 (unassessed)
  » Species Achnanthes quadricauda Turpin, 1828 (unassessed)
  » Species Achnanthes quadrijuga Turpin, 1828 (unassessed)
  » Species Achnanthes quadripunctata D.R. Oppenheim, 1995 (unassessed)
  » Species Achnanthes qualternus Turpin in Mém. Mus. according to Mills, 1828 (unassessed)
  » Species Achnanthes radiata Skvortzov, 2012
    » Variety Achnanthes radiata var. nipponica Skvortzov, 2012 (uncertain)
  » Species Achnanthes radiata Du & Cheng, 1984 (unassessed)
  » Species Achnanthes radiatus Hohn & Hellerman, 1966 (unassessed)
  » Species Achnanthes radiosa Hustedt ex Simonsen, 1987 (unassessed)
  » Species Achnanthes radiosa Hustedt in Schmidt et al., 1936 (unassessed)
  » Species Achnanthes ramosa P.L.Crouan & H.M.Crouan (unassessed)
  » Species Achnanthes ranomafanensis Manguin, 1952 (unassessed)
  » Species Achnanthes rara Jurilj, 1957 (unassessed)
  » Species Achnanthes rarissima Skvortzov, 2012
  » Species Achnanthes rautenbachiae Cholnoky, 1957 (unassessed)
  » Species Achnanthes recava Hohn & Hellerman, 1966 (unassessed)
  » Species Achnanthes rechtensis Leclercq, 1983 (unassessed)
  » Species Achnanthes recurva Ehrenberg, 1858 (unassessed)
  » Species Achnanthes recurvata Hustedt, 1937 (unassessed)
  » Species Achnanthes reidensis Foged, 1978 (unassessed)
  » Species Achnanthes reimeri Camburn in Camburn, Lowe & Stoneburner, 1978 (unassessed)
  » Species Achnanthes renei Lange-Bertalot & Schmidt, 1990 (unassessed)
  » Species Achnanthes repanda Tsumura & Iwahashi, 1955 (unassessed)
  » Species Achnanthes repestoides ‘Hohn' VanLandingham, 1967 (unassessed)
  » Species Achnanthes restricta Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes reversa Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes rhombica Oestrup, 1910 (unassessed)
  » Species Achnanthes rhombica Skabichevskii, 1987 (unassessed)
  » Species Achnanthes rhombica Voigt in Meister, 1935 (unassessed)
  » Species Achnanthes rhomboides Ehrenberg, 1843 (unassessed)
  » Species Achnanthes rhynchocephala Cleve-Euler, 1915 (unassessed)
  » Species Achnanthes rivularia Frenguelli, 1925 (unassessed)
  » Species Achnanthes robusta Rivera, 1973 (unassessed)
  » Species Achnanthes rollae Suxena & Venkateswarlu, 1968 (unassessed)
  » Species Achnanthes rosenstockii Lange-Bertalot, 1989 (unassessed)
    » Variety Achnanthes rosenstockii var. sinepuncta Lange-Bertalot, 1991 (uncertain, unassessed)
  » Species Achnanthes rossii Hustedt, 1954 (unassessed)
  » Species Achnanthes rostellata A.Cleve, 1934 (unassessed)
  » Species Achnanthes rostrata Oestrup, 1902 (unassessed)
  » Species Achnanthes rupestoides Hohn, 1961 (unassessed)
  » Species Achnanthes sapinii-jaloustrei Manguin, 1957 (unassessed)
  » Species Achnanthes saxatilis Bock, 1970 (unassessed)
  » Species Achnanthes saxonica Krasske ex Hustedt, 1933 (unassessed)
  » Species Achnanthes saxophila Lange-Bertalot & Krammer (unassessed)
  » Species Achnanthes schmidtiana Krenner, 1926 (unassessed)
  » Species Achnanthes schmidtii Heiden in Heiden & Kolbe, 1928 (unassessed)
  » Species Achnanthes schoemaniana Giffen, 1984 (unassessed)
  » Species Achnanthes schultzii Cholnoky, 1933 (unassessed)
  » Species Achnanthes schulzi Brockmann, 1954 (unassessed)
  » Species Achnanthes Schulzii Cleve-Euler, 1932 (unassessed)
  » Species Achnanthes schwabei Krasske, 1939 (unassessed)
  » Species Achnanthes scotica R.J.Flower & V.J.Jones, 1989 (unassessed)
  » Species Achnanthes scotica Lange-Bertalot, 1993 (unassessed)
  » Species Achnanthes scutiformis Moiseeva, 1960 (unassessed)
    » Variety Achnanthes scutiformis var. delicatula I.Kaczmarska, 1985 † (uncertain, unassessed)
  » Species Achnanthes semen Ehrenberg, 1854 (unassessed)
  » Species Achnanthes semiaperta Hustedt, 1945 (unassessed)
  » Species Achnanthes separata Hustedt ex Simonsen, 1987 (unassessed)
  » Species Achnanthes separata Hustedt in Schmidt et al., 1958 (unassessed)
  » Species Achnanthes septata Cleve-Euler (unassessed)
    » Variety Achnanthes septata var. incurvata (Østrup) Cleve-Euler, 1953 represented as Achnanthes subsessilis var. incurvata Østrup, 1895
    » Variety Achnanthes septata var. doljensis Jurilj, 1957 (uncertain, unassessed)
    » Variety Achnanthes septata var. linearis Cleve-Euler, 1953 (uncertain, unassessed)
    » Variety Achnanthes septata var. septata Cleve-Euler, 1915 (uncertain, unassessed)
    » Variety Achnanthes septata var. sussedana Jurilj, 1957 (uncertain, unassessed)
  » Species Achnanthes seriata C.Agardh, 1827 (unassessed)
    » Variety Achnanthes seriata var. cuneata Grunow in Cleve & Grunow, 1880 (uncertain, unassessed)
  » Species Achnanthes siamexilis Lange-Bertalot in Lange-Bertalot & Krammer, 1989 (unassessed)
  » Species Achnanthes siamlinearis Lange-Bertalot in Lange-Bertalot & Krammer, 1989 (unassessed)
  » Species Achnanthes sibayiensis Archibald, 1966 (unassessed)
  » Species Achnanthes siberica Cleve-Euler, 1953 (unassessed)
  » Species Achnanthes sigmoides Ehrenberg, 1873 (unassessed)
  » Species Achnanthes silvahercynia Lange-Bertalot, 1989 (unassessed)
  » Species Achnanthes similis McCall, 1933 (unassessed)
  » Species Achnanthes similis Hustedt, 1935 (unassessed)
  » Species Achnanthes similivalvata Manguin, 1952 (unassessed)
  » Species Achnanthes simplex Hustedt, 1939 (unassessed)
  » Species Achnanthes sinuata Kützing according to M. Peragallo (unassessed)
  » Species Achnanthes skvortzowii Hustedt in Schmidt et al., 1958 (unassessed)
  » Species Achnanthes skvortzowii Jasnitsky, 1936 (unassessed)
  » Species Achnanthes solea Zimmermann, 1917 (unassessed)
  » Species Achnanthes solea Hustedt, 1952 (unassessed)
  » Species Achnanthes sonyda B.Hartley, 1986 (unassessed)
  » Species Achnanthes speciosa Hustedt, 1927 (unassessed)
  » Species Achnanthes sperata Cholnoky, 1962 (unassessed)
  » Species Achnanthes sphacelata Carter, 1970 (unassessed)
  » Species Achnanthes spiculata K.E. Lohman, 1957 (unassessed)
  » Species Achnanthes standeri Cholnoky, 1957 (unassessed)
  » Species Achnanthes stauroneiformis Skabichevskij, 1936 (unassessed)
  » Species Achnanthes stauroneiformis Prowse, 1962 (unassessed)
  » Species Achnanthes stauroneioides Manguin in Bourrelly & Manguin, 1954 (unassessed)
  » Species Achnanthes stewartii Patrick, 1945 (unassessed)
  » Species Achnanthes stipitata (Lyngbye) Ehrenberg, 1834 (unassessed)
  » Species Achnanthes stomatimorpha Turpin, 1828 (unassessed)
  » Species Achnanthes stomatophora ‘Turpin' VanLandingham, 1979 (unassessed)
  » Species Achnanthes straubiana Lange-Bertalot, 1996 (unassessed)
  » Species Achnanthes striata [Suhr], Drège, 1843 (unassessed)
  » Species Achnanthes striata Suhr ms., Kützing, 1844 (unassessed)
    » Variety Achnanthes striata var. striata Skvortzow & Meyer, 1928 (uncertain, unassessed)
  » Species Achnanthes striata ‘Chase', 1885 (unassessed)
  » Species Achnanthes striatella Skvortzov, 2012
  » Species Achnanthes stroemii Hustedt, 1933 (unassessed)
    » Forma Achnanthes stroemii f. robusta Schljapina (uncertain, unassessed)
  » Species Achnanthes subaffinis Cholnoky, 1959 (unassessed)
    » Variety Achnanthes subaffinis var. dudpokharii Suxena & Venkateswarlu, 1968 (uncertain, unassessed)
  » Species Achnanthes subatomus Hustedt, 1939 (unassessed)
  » Species Achnanthes subcrassa Maillard ex Lange-Bertalot & Steidorf in Moser, Steindorf & Lange-Bertalot, 1995 (unassessed)
  » Species Achnanthes subcrassa Maillard, 1978 (unassessed)
  » Species Achnanthes subcrenulata Cleve, 1891 (unassessed)
  » Species Achnanthes subelata D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005 (unassessed)
  » Species Achnanthes subexigua Hustedt, 1934 (unassessed)
  » Species Achnanthes subfragilis (Skvortzov)
  » Species Achnanthes subhastata (Skvortzov)
  » Species Achnanthes subhyalina Conger, 1964 (unassessed)
  » Species Achnanthes sublaevis Hustedt, 1937 (unassessed)
    » Variety Achnanthes sublaevis var. crassa C.W.Reimer, 1966 (uncertain, unassessed)
  » Species Achnanthes sublevanderi Manguin, 1949 (unassessed)
  » Species Achnanthes sublevanderi Manguin emend Schoeman, 1970 (unassessed)
  » Species Achnanthes sublinearis Skvortzov (unassessed)
    » Variety Achnanthes sublinearis var. complexa Skvortzow, 1938 (uncertain, unassessed)
    » Variety Achnanthes sublinearis var. elliptica Skvortzow, 1938 (uncertain, unassessed)
    » Variety Achnanthes sublinearis var. sublinearis Skvortzow, 1938 (uncertain, unassessed)
  » Species Achnanthes sublitoralis Skabichevskii, 1976 (unassessed)
  » Species Achnanthes submarina Hustedt, 1956 (unassessed)
  » Species Achnanthes submontana Gandhi, 1970 (unassessed)
  » Species Achnanthes subrostrata Hustedt, 1942 (unassessed)
    » Variety Achnanthes subrostrata var. appalachiana Camburn & Lowe, 1978 (uncertain, unassessed)
  » Species Achnanthes subsalsa J.B.Petersen, 1928 (unassessed)
  » Species Achnanthes subsalsoides Hustedt, 1933 (unassessed)
    » Variety Achnanthes subsalsoides var. sterwennensis Germain & Chaumont, 1976 (uncertain, unassessed)
  » Species Achnanthes subsaxonica Cholnoky, 1960 (unassessed)
  » Species Achnanthes subsenilis (unassessed)
    » Variety Achnanthes subsenilis var. incurvata ‘Østrup' M. Peragallo, 1921 (uncertain, unassessed)
  » Species Achnanthes subtropica Cholnoky, 1960 (unassessed)
  » Species Achnanthes subventricosa Grunow ex Cleve & Möller, 1877 (unassessed)
  » Species Achnanthes sumara Carter, 1966 (unassessed)
  » Species Achnanthes suspecta A.Cleve, 1934 (unassessed)
  » Species Achnanthes sutura Carter, 1970 (unassessed)
  » Species Achnanthes swazi Cholnoky, 1960 (unassessed)
  » Species Achnanthes taeniata Gran, 1897 (unassessed)
  » Species Achnanthes taiaensis Carter & Denny, 1982 (unassessed)
  » Species Achnanthes tanensis Cleve-Euler, 1934 (unassessed)
  » Species Achnanthes tatrensis Starmach, 1973 (unassessed)
  » Species Achnanthes taylorensis D.E. Kellogg, M. Stuiver, T.B. Kellogg & G.H. DEnton, 1980 (unassessed)
  » Species Achnanthes temperei M.Peragallo, 1908 (unassessed)
  » Species Achnanthes tenera Hustedt, 1955 (unassessed)
  » Species Achnanthes tenuis Hustedt, 1955 (unassessed)
  » Species Achnanthes tenuissima Pantocsek, 1902 (unassessed)
  » Species Achnanthes tenuistauros Mann, 1925 (unassessed)
  » Species Achnanthes tenuistriata Hustedt, 1952 (unassessed)
  » Species Achnanthes terrae-novae Woodhead & Tweed, 1960 (unassessed)
  » Species Achnanthes teshekpukensis Foged, 1968 (unassessed)
  » Species Achnanthes therezienii Lange-Bertalot & Krammer, 1989 (unassessed)
  » Species Achnanthes thienemannii Hustedt, 1942 (unassessed)
  » Species Achnanthes tibetica Jao, 1964 (unassessed)
  » Species Achnanthes triconfusa Van Landingham, 1967 (unassessed)
  » Species Achnanthes trigibba Hustedt ex Simonsen, 1987 (unassessed)
  » Species Achnanthes trigibba Hustedt in Schmidt et al., 1937 (unassessed)
  » Species Achnanthes trigibba Hustedt ex Gandhi, 1970 (unassessed)
  » Species Achnanthes trijuga ‘Turpin' according to VanLandingham, 1828 (unassessed)
  » Species Achnanthes trinodis Ehrenberg, 1870 (unassessed)
  » Species Achnanthes tropica Hustedt, 1937 (unassessed)
  » Species Achnanthes tuma Carter, 1970 (unassessed)
  » Species Achnanthes tumescens A.R.Sherwood & R.L.Lowe, 2009 (unassessed)
  » Species Achnanthes turgens Ehrenberg, 1843 (unassessed)
  » Species Achnanthes turgida Ehrenberg, 1853 (unassessed)
  » Species Achnanthes ubiqua Maidana, 1986 (unassessed)
  » Species Achnanthes umara J.R.Carter, 1970 (unassessed)
  » Species Achnanthes undata Meister, 1934 (unassessed)
  » Species Achnanthes undulatus Sreenivasa, 1971 (unassessed)
  » Species Achnanthes undulorostrata R.L.Lowe & A.R.Sherwood, 2009 (unassessed)
  » Species Achnanthes unipunctatus Missuna, 1914 (unassessed)
  » Species Achnanthes utukakensis Patrick & Freese, 1961 (unassessed)
  » Species Achnanthes valida Hustedt ex R.Simonsen, 1987 (unassessed)
  » Species Achnanthes vanhoffenii Heiden in Heiden & Kolbe, 1928 (unassessed)
  » Species Achnanthes vasta Pantocsek, 1902 (unassessed)
  » Species Achnanthes vaszaryi (Pantocsek) Cleve (unassessed)
  » Species Achnanthes veccillum Bory, 1832 (unassessed)
  » Species Achnanthes ventricosa Kützing, 1844 (unassessed)
  » Species Achnanthes ventricosa Ehrenberg, 1854 (unassessed)
  » Species Achnanthes vernalis Pantocsek, 1902 (unassessed)
  » Species Achnanthes vexillum Bory, 1832 (unassessed)
  » Species Achnanthes vicentii Manguin, 1957 (unassessed)
  » Species Achnanthes volhyniensis Oksiyuk, 1957 (unassessed)
  » Species Achnanthes wellsiae Reimer, 1966 (unassessed)
  » Species Achnanthes wickenensis J.R.Carter, 1963 (unassessed)
  » Species Achnanthes woldstedtii Hustedt, 1954 (unassessed)
  » Species Achnanthes wolffii Foged, 1957 (unassessed)
  » Species Achnanthes woodlawnensis Playfair, 1915 (unassessed)
  » Species Achnanthes wrightiana Woodhead & Tweed, 1960 (unassessed)
  » Species Achnanthes yaquinensis McIntire & Reimer, 1974 (unassessed)
  » Species Achnanthes yeniseyensis Skvortzow, 1971 (unassessed)
    » Variety Achnanthes yeniseyensis var. undulata Skvortzow, 1971 (uncertain, unassessed)
  » Species Achnanthes ziegleri Lange-Bert., 1993 (unassessed)
  » Species Achnanthes ziegleri Lange-Bert. in Krammer & Lange-Bertalot in H. Ettl et al., 1991 (unassessed)
Genus Amphicocconeis M. De Stephano & D. Marino, 2002
Genus Haloroundia C.A.Düaz & N.I.Maidana, 2006
Genus Platebaikalia Kulikovskiy, Glushchenko, Genkal & Kociolek, 2020
Genus Platessa H. Lange-Bertalot, 2004
  » Species Platessa baicalensis Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2015
  » Species Platessa baicalofontellii Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2015
  » Species Platessa fontellii (Cleve-Euler) Lange-Bertalot & Kulikovskiy in Kulikovskiy et al., 2015
  » Species Platessa guianensis Le Cohu, Tudesque & C.E.Wetzel, 2016
  » Species Platessa itoupensis Tudesque, Le Cohu & C.E.Wetzel, 2016
  » Species Platessa kingstonii M.Potapova, 2012
  » Species Platessa krejcii (Hustedt, 1937) C.E.Wetzel, Tudesque & Le Cohu, 2016
  » Species Platessa lutheri (Hustedt) Potapova, 2012
  » Species Platessa rhombicolanceolata Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2015
  » Species Platessa stewartii (Patrick) M.Potapova, 2012
  » Species Platessa strelnikovae M.D.Enache, M.Potapova & E.A.Morales, 2014
  » Species Platessa tropica (Hustedt, 1939) C.E.Wetzel, Tudesque & Le Cohu, 2016
  » Species Platessa undulans Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2015
  » Species Platessa uniseriata (Lange-Bertalot & Monnier, 2003) C.E.Wetzel, Tudesque & Le Cohu, 2016
  » Species Platessa bahlsii Potapova, 2012 represented as Planothidium bahlsii (Potapova) Kulikovskiy, Glushchenko & Kociolek
  » Species Platessa brevicostata (Hustedt) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004 represented as Cocconeis brevicostata var. brevicostata Hustedt, 1937
  » Species Platessa cataractum (Hustedt) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004 represented as Cocconeis cataractarum Hustedt in Schmidt, 1936
  » Species Platessa conspicua (A.Mayer) Lange-Bertalot, 2004 represented as Achnanthes conspicua var. conspicua A.Mayer, 1919
  » Species Platessa elegans Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2015 represented as Platebaikalia elegans (Kulikovskiy & Lange–Bertalot) Kulikovskiy, Glushchenko, Genkal & Kociolek, 2020
  » Species Platessa guangzhouae Liu & Kociolek, 2014 represented as Psammothidium guangzhouae (Y. Liu & J.P. Kociolek) Kulikovskiy, Glushchenko & Kociolek, 2020
  » Species Platessa holsatica (Hustedt) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004 represented as Achnanthes holsatica Hustedt, 1936
  » Species Platessa hustedtii (Krasske) Lange-Bertalot, 2004 represented as Cocconeis hustedtii Krasske, 1923
  » Species Platessa montana (Krasske) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004 represented as Achnanthes montana var. montana Krasske, 1929
  » Species Platessa obscura (Krasske) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004 represented as Cocconeis brevicostata var. obscura Krasske, 1938
  » Species Platessa rupestris (Krasske) Lange-Bertalot, 2004 represented as Achnanthes rupestris var. rupestris Krasske, 1932
  » Species Platessa ziegleri (Lange-Bertalot) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004 represented as Achnanthes ziegleri Lange-Bert., 1993
  » Species Platessa bavarica Lange-Bertalot & Hofmann, 2004 (uncertain, unassessed)

Genus Achnantella Gaillon, 1833 accepted as Achnanthes Bory, 1822 (Superfluous substitute name)
marine
Not documented
Kociolek, J.P.; Balasubramanian, K.; Blanco, S.; Coste, M.; Ector, L.; Liu, Y.; Kulikovskiy, M.; Lundholm, N.; Ludwig, T.; Potapova, M.; Rimet, F.; Sabbe, K.; Sala, S.; Sar, E.; Taylor, J.; Van de Vijver, B.; Wetzel, C.E.; Williams, D.M.; Witkowski, A.; Witkowski, J. (2018). DiatomBase. Achnanthaceae Kützing, 1844. Accessed at: http://www.diatombase.org/aphia.php?p=taxdetails&id=149190 on 2020-05-28
Date
action
by
2005-03-30 08:52:46Z
created
db_admin

basis of record Round, F.E.; Crawford, R.M.; Mann, D.G. (1990). The diatoms: biology and morphology of the genera. Cambridge University Press: London, UK. ISBN 0-521-363187. 747 pp. (look up in IMIS[details]   
 
 Present  Inaccurate  Introduced: alien  Containing type locality 
 



LanguageName 
Japanese ツメケイソウ/アクナンテス科  [details]
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