Angusticopula cosmica Goeyers & Van de Vijver, 2020
Angusticopula dickei (Thwaites) Houk et al., 2017
Angusticopula robusta (Hustedt) Houk et al., 2017
Angusticopula robusta subsp. ruttneri (Hustedt) Houk et al., 2017
Angusticopula rowlingiana Van de Vijver et al., 2019
Angusticopula ruttneri (Hustedt, 1937) Houk et al., 2017
Druridgea compressa (T.West) Hustedt, 1928
Druridgea geminata Donkin, 1861 accepted as Druridgea compressa (T.West) Hustedt, 1928
Ferocia houkiana Goeyers & Van de Vijver, 2020
Ferocia ninae Van de Vijver & Houk in Van de Vijver et al., 2017
Ferocia setosa Van de Vijver & Houk in Van de Vijver et al., 2017
Ferocia subantarctica Van de Vijver & Houk, 2019
Gaillionella arctica Ehrenberg, 1853 accepted as Gaillonella arctica (Dickie) Ehrenberg, 1853 accepted as Melosira arctica var. arctica Dickie in litt., Ehrenberg, 1853
Gaillionella coronata Ehrenberg, 1845 accepted as Gaillonella coronata Ehrenberg, 1845
Gaillionella crenulata Ehrenberg, 1843 accepted as Aulacoseira crenulata (Ehrenberg) Thwaites, 1848
Gaillionella crenulata var. valida Pelletan, 1889 (uncertain > unassessed )
Gaillionella distans Ehrenberg, 1836 accepted as Aulacoseira distans (Ehrenberg) Simonsen, 1979 †
Gaillionella italica Ehrenberg, 1838 accepted as Aulacoseira italica (Ehrenberg) Simonsen, 1979
Gaillionella lirata Ehrenberg, 1843 accepted as Gaillonella lirata Ehrenberg, 1843
Gaillionella sulcata Ehrenberg, 1838 accepted as Paralia sulcata (Ehrenberg) Cleve, 1873
Gaillionella undulata Ehrenberg, 1840 accepted as Melosira undulata (Ehrenberg) Kützing, 1844
Melosira accinctus Hohn & Hellerman, 1963 (uncertain > unassessed )
Melosira aculeifera Scheschukova-Poretzkaya in Scheschukova-Poretzkaya & Moissejeva, 1964 (uncertain > unassessed )
Melosira adeliae Manguin, 1957 (uncertain > unassessed )
Melosira aequalis Agardh, 1832 (uncertain > unassessed )
Melosira africana Leuduger-Fortmorel, 1898 (uncertain > unassessed )
Melosira agassizii Ostenfeld, 1909
Melosira agassizii var. agassizii Ostenfeld, 1909 (uncertain > unassessed )
Melosira agassizii var. malayensis Hustedt, 1942 (uncertain > unassessed )
Melosira agria Pantocsek, 1905 (uncertain > unassessed )
Melosira akkavaarensis Tynni, 1982 (uncertain > unassessed )
Melosira albicans Sheshukova, 1961 (uncertain > unassessed )
Melosira alphabetica Mann, 1937 (uncertain > unassessed )
Melosira alternans Pouchet, 1893 (uncertain > unassessed )
Melosira ambigua (Grunow) O.F.Müller (uncertain > unassessed )
Melosira ambigua f. altaica Skabichevskij, 1966 (uncertain > unassessed )
Melosira ambigua f. ambigua (Grunow in Van Heurck) Otto Müller, 1903 accepted as Melosira crenulata var. ambigua Grunow, 1882
Melosira ambigua f. curvata A.P.Skabichevskij, 1960 (uncertain > unassessed )
Melosira ambigua f. curvata Cheremisinova??, 1968 (uncertain > unassessed )
Melosira ambigua f. spiralis Skuja, 1948 (uncertain > unassessed )
Melosira ambigua f. spiroides N.A.Chalfina, 1966 (uncertain > unassessed )
Melosira ambigua var. alpha Hustedt, 1927 (uncertain > unassessed )
Melosira ambigua var. beta Hustedt, 1927 (uncertain > unassessed )
Melosira ambigua var. desikacharya Rao & Awasthi, 1963 (uncertain > unassessed )
Melosira ambigua var. krishna Rao & Awasthi, 1963 (uncertain > unassessed )
Melosira ambigua var. laradura Rao & Awasthi, 1963 (uncertain > unassessed )
Melosira ambigua var. puncticulosa (Otto Müller) (uncertain > unassessed )
Melosira ambigua var. robusta Gasse, 1980 accepted as Aulacoseira gadebensis (Gasse, 1980) Mohan & Stone, 2016 †
Melosira ambigua var. variata (Otto Müller) (uncertain > unassessed )
Melosira americana Kützing, 1844 (uncertain > unassessed )
Melosira americana f. americana Kützing, 1844 (uncertain > unassessed )
Melosira americana f. nipponica Skvortzow, 1936 (uncertain > unassessed )
Melosira anastomosans Grunow in Van Heurck, 1882 (uncertain > unassessed )
Melosira angulata (Gregory) Rabenhorst, 1864 accepted as Orthosira angulata Gregory, 1857
Melosira angulata var. angustissima Borutskii, 1952 (uncertain > unassessed )
Melosira angustissima Neizvestnova-Zhadina, 1941 (uncertain > unassessed )
Melosira annularis Eichwald, 1847 (uncertain > unassessed )
Melosira anormal Van Heurck, 1882 (uncertain > unassessed )
Melosira antarctica Van Heurck, 1909 (uncertain > unassessed )
Melosira antiqua A.I.Moiseeva, 1963 † accepted as Alveolophora antiqua (A.I.Moisseeva) A.I.Moisseeva, 1990 †
Melosira architecturalis Brun in Schmidt et al., 1892 † (uncertain > unassessed )
Melosira arctica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella arctica (Dickie) Ehrenberg, 1853 accepted as Melosira arctica var. arctica Dickie in litt., Ehrenberg, 1853
Melosira arctica Dickie, 1852 (uncertain > unassessed )
Melosira arctica var. arctica Dickie in litt., Ehrenberg, 1853 (uncertain > unassessed )
Melosira arctica var. bornholmiensis Cleve-Euler, 1934 (uncertain > unassessed )
Melosira arctica var. krembsii I. Kaczmarska & R. Jahn, 2006 (uncertain > unassessed )
Melosira arctica var. subarctica (Otto Müller) (uncertain > unassessed )
Melosira arcuata Pantocsek, 1892 (uncertain > unassessed )
Melosira arenaria Moore ex Ralfs, 1843 accepted as Ellerbeckia arenaria (Moore ex Ralfs) R.M.Crawford, 1988 accepted as Melosira arenaria var. arenaria Moore ex Ralfs, 1843
Melosira arenaria f. baikalensis Skvortzow, 1937 (uncertain > unassessed )
Melosira arenaria f. ornata Skvortzow, 1937 (uncertain > unassessed )
Melosira arenaria f. punctata Skvortzow, 1937 (uncertain > unassessed )
Melosira arenaria f. teres (Brun) Tynni, 1982 accepted as Melosira teres Brun, 1892
Melosira arenaria var. arenaria Moore ex Ralfs, 1843 (uncertain > unassessed )
Melosira arenaria var. definita Østrup, 1908 (uncertain > unassessed )
Melosira arenaria var. fossilis Pantocsek, 1913 (uncertain > unassessed )
Melosira arenaria var. granulata Gutwinski, 1890 (uncertain > unassessed )
Melosira arenaria var. hungarica Pantocsek, 1889 (uncertain > unassessed )
Melosira arenaria var. laevis Héribaud, 1903 (uncertain > unassessed )
Melosira arenaria var. nova Yakowleff, 1924 (uncertain > unassessed )
Melosira arenaria var. ornata Pantocsek, 1913 (uncertain > unassessed )
Melosira arenaria var. tertiaria Pantocsek, 1913 (uncertain > unassessed )
Melosira arenaria var. varennarum (M. Peragallo & Heribaud in Heribaud) F.W. Mills, 1934 accepted as Melosira varennarum M. Peragallo & Héribaud in Héribaud, 1893
Melosira arenaria var. vestita Pantocsek, 1913 (uncertain > unassessed )
Melosira arenosa Moore ex Hassall, 1852 (uncertain > unassessed )
Melosira arentii (Kolbe) Nagumo & Kobayasi, 1977 accepted as Cyclotella arentii Kolbe, 1948
Melosira areolata A.I.Moissejeva, 1971 accepted as Alveolophora areolata A.I.Moiseeva, 1990 †
Melosira areolata O.Müller, 1904 (uncertain > unassessed )
Melosira argus Otto Müller, 1904 (uncertain > unassessed )
Melosira argus f. alpha (uncertain > unassessed )
Melosira argus f. alpha minor Otto Müller, 1904 (uncertain > unassessed )
Melosira argus f. argus Otto Müller, 1904 (uncertain > unassessed )
Melosira argus f. beta (uncertain > unassessed )
Melosira argus f. beta minor Otto Müller, 1904 (uncertain > unassessed )
Melosira argus var. granulosa (Otto Müller) (uncertain > unassessed )
Melosira argus var. trimorpha Otto Müller (uncertain > unassessed )
Melosira arundinacea F.S.Castracane degli Antelminelli (uncertain > unassessed )
Melosira arundinacea f. arundinacea Castracane, 1894 (uncertain > unassessed )
Melosira arundinacea f. minor Castracane in litt., 1893 (uncertain > unassessed )
Melosira asiatica Brun in Schmidt et al., 1892 accepted as Cyclotella asiatica Brun in Brun & Tempère, 1889