Campylopyxis garkeana (Grunow) L.K.Medlin, 1985 accepted as Rhoikoneis garkeana var. garkeana Grunow, 1863
Campylopyxis germainii D.G. Mann, 1990 (uncertain > unassessed )
Cuneolus minutus Giffen, 1970 (uncertain > unassessed )
Cuneolus skvortzowii (Nikolajev) Medlin in Medlin & Round, 1986 accepted as Gomphonema skvortzowii Nikolaev, 1970
Gomphonemopsis exigua (Kützing) Medlin in Medlin & Round, 1986 (uncertain > unassessed )
Gomphonemopsis exigua var. platypus (Østrup) Snoeijs in Snoeijs & Balashova, 1998 accepted as Gomphonema platypus Østrup, 1910
Gomphonemopsis lindae Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996 (uncertain > unassessed )
Gomphonemopsis littoralis (Hendey) Medlin in Medlin & Round, 1986 accepted as Gomphonema littorale Hendey, 1977
Gomphonemopsis obscura (Krasske) Lange-Bertalot, 1996
Gomphonemopsis pseudexigua (Simonsen) Medlin in Medlin & Round, 1986 accepted as Gomphonema pseudoexiguum Simonsen, 1959
Gomphonemopsis sieminskae Krzywda, Gastineau, Ch. Zhou & Witkowski, 2019
Gomphoseptatum aestuarii (Cleve) Medlin in Medlin & Round, 1986 accepted as Gomphonema aestuarii Cleve, 1893
Gomphoseptatum pseudoseptatum (Giffen) A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000 accepted as Gomphonema pseudoseptatum Giffen, 1970
Gomphosphenia americana Kociolek & Thomas in Kociolek et al., 2014
Gomphosphenia fontinalis H. Lange-Bertalot, L. Ector & M. Werum in Werum & Lange-Bertalot, 2004
Gomphosphenia grovei (M.Schmidt) Lange-Bertalot, 1995
Gomphosphenia grovei var. lingulata (Hustedt) Lange-Bertalot, 1995 accepted as Gomphonema lingulatum var. lingulatum Hustedt, 1927
Gomphosphenia holmquistii (Foged) Lange-Bertalot, 1995
Gomphosphenia holmquistii var. alaskaensis (Foged) Lange-Bertalot, 1995 accepted as Gomphonema holmquistii var. alaskaensis Foged, 1968
Gomphosphenia indistincta Kociolek & Thomas in Kociolek et al., 2014
Gomphosphenia lingulatiformis (Lange-Bertalot & E.Reichardt) Lange-Bertalot, 1995
Gomphosphenia minima C. Delgado, S. Blanco, L. González-Paz & S.F.P. Almeida, 2022
Gomphosphenia oahuensis (Hustedt) Lange-Bertalot
Gomphosphenia paradoxa Lange-Bertalot, 1995 (uncertain > unassessed )
Gomphosphenia pfannkucheae (B.J.Cholnoky) Lange-Bertalot, 1995
Gomphosphenia praegans J.A.Ress, E.W.Thomas & Kociolek, 2016
Gomphosphenia reicheltii (M. Schmidt) Lange-Bertalot, 1995 (uncertain > unassessed )
Gomphosphenia ryukyuensis Tuji & Ohtsuka, 2016
Gomphosphenia stoermeri J.P.Kociolek & E.W.Thomas, 2009
Gomphosphenia tackei (Hustedt) Lange-Bertalot, 1995
Gomphosphenia tenerrima (Hustedt) E. Reichardt, 1999 (uncertain > unassessed )
Gomphosphenia tenuis Z.Levkov & D.M.Williams, 2011
Gomphosphenia vallei Beauger, C.E.Wetzel, Allain & Ector in Beauger et al., 2022
Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
Rhoicosphenia adolfi M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia adriatica Caput Mihalic & Levkov, 2010
Rhoicosphenia affinis Levkov, 2010
Rhoicosphenia assymmetrica (Gutwinski) Gutwinski, 1892 accepted as Gomphonema asymmetricum Gutwinski, 1890
Rhoicosphenia asymmetrica (Gutwinski) Schonfeldt, 1913 accepted as Gomphonema asymmetricum Gutwinski, 1890
Rhoicosphenia baicalensis Skabichevskii, 1976 (uncertain > unassessed )
Rhoicosphenia baltica (Schumann) Z. Levkov in Levkov et al., 2010 accepted as Rhoicosphenia fracta var. baltica Schumann, 1867
Rhoicosphenia californica E.W.Thomas & Kociolek, 2015
Rhoicosphenia contractum (Kützing) Rabenhorst, 1864 accepted as Gomphonema contractum Kützing, 1844
Rhoicosphenia curvata (Kützing) Grunow, 1860 accepted as Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
Rhoicosphenia curvata f. curvata (Kützing) Grunow, 1860 accepted as Gomphonema curvatum var. curvatum Kützing, 1833 (1834)
Rhoicosphenia curvata f. marina Heiden in Heiden & Kolbe, 1928 (uncertain > unassessed )
Rhoicosphenia curvata f. marina Peragallo & Peragallo, 1897 (uncertain > unassessed )
Rhoicosphenia curvata f. maxima Iwahashi, 1937 (uncertain > unassessed )
Rhoicosphenia curvata f. minor M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia curvata f. minor Schaarschmidt, 1882 (uncertain > unassessed )
Rhoicosphenia curvata var. aquatica (Kützing) Rabenhorst, 1864 accepted as Gomphonema curvatum var. aquaticum Kützing, 1844
Rhoicosphenia curvata var. baicalensis Skvortzow & Meyer, 1928 (uncertain > unassessed )
Rhoicosphenia curvata var. baltica (Schumann) Cleve-Euler, 1953 (uncertain > unassessed )
Rhoicosphenia curvata var. curvata (uncertain > unassessed )
Rhoicosphenia curvata var. elongata Cleve-Euler, 1953 (uncertain > unassessed )
Rhoicosphenia curvata var. fracta (Schumann) Cleve, 1895 accepted as Gomphonema fractum J.Schumann, 1862
Rhoicosphenia curvata var. fracta sensu Cleve-Euler, 1932 (uncertain > unassessed )
Rhoicosphenia curvata var. genuina Cleve-Euler, 1953 (uncertain > unassessed )
Rhoicosphenia curvata var. gracilis M.Schmidt, 1899 (uncertain > unassessed )
Rhoicosphenia curvata var. heterosticta M. Schmidt (uncertain > unassessed )
Rhoicosphenia curvata var. linearis Cleve-Euler, 1915 (uncertain > unassessed )
Rhoicosphenia curvata var. lunaris Cleve-Euler, 1915 (uncertain > unassessed )
Rhoicosphenia curvata var. major Cleve, 1895 (uncertain > unassessed )
Rhoicosphenia curvata var. marina (Kützing) Rabenhorst, 1864 accepted as Gomphonema curvatum var. marinum Kützing, 1844
Rhoicosphenia curvata var. marina Grunow sensu Wuorentaus, 1912 accepted as Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
Rhoicosphenia curvata var. minor (M. Schmidt in Schmidt et al.) Tempère & Peragallo, 1915 (uncertain > unassessed )
Rhoicosphenia curvata var. pulvinata (Kützing) Rabenhorst, 1864 accepted as Gomphonema curvatum var. pulvinatum Kützing, 1849
Rhoicosphenia curvata var. pulvinata Kützing, 1849 (uncertain > unassessed )
Rhoicosphenia curvata var. salina (Kützing) Rabenhorst, 1864 (uncertain > unassessed )
Rhoicosphenia curvata var. sessilis Mereschkowsky, 1902 (uncertain > unassessed )
Rhoicosphenia curvata var. subacuta M.Schmidt, 1899 (uncertain > unassessed )
Rhoicosphenia curvata var. varians Vailionis, 1930 (uncertain > unassessed )
Rhoicosphenia cuspidata (Rabenhorst) De Toni, 1891 accepted as Gomphonema cuspidatum G.L.Rabenhorst, 1853
Rhoicosphenia dalmatica Rabenhorst ex Reinhard, 1885 (uncertain > unassessed )
Rhoicosphenia flexa M.Schmidt cf Giffen acc.J.R.Carter et al. (uncertain > unassessed )
Rhoicosphenia fossilis Cleve-Euler, 1915 (uncertain > unassessed )
Rhoicosphenia fracta (Schumann) De Toni, 1891
Rhoicosphenia fracta var. baltica Schumann, 1867 (uncertain > unassessed )
Rhoicosphenia fracta var. fracta (Schumann) Rabenhorst, 1864 accepted as Gomphonema fractum J.Schumann, 1862
Rhoicosphenia gandhii E.W. Thomas, B. Karthick & Kociolek, 2014 †
Rhoicosphenia genuflexa (Kützing) L.K.Medlin, 1984 accepted as Navicula genuflexa Kützing, 1844
Rhoicosphenia indica E.W. Thomas, B. Karthick & Kociolek, 2014 †
Rhoicosphenia kolbei A. Berg, 1952 (uncertain > unassessed )
Rhoicosphenia lacustris Levkov, 2010
Rhoicosphenia lesothensis Schoeman, 1973 accepted as Nupela lesothensis (Schoeman) H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
Rhoicosphenia linearis Østrup, 1912 (uncertain > unassessed )
Rhoicosphenia lowei E.W.Thomas & Kociolek, 2015
Rhoicosphenia macedonica Z.Levkov, 2007
Rhoicosphenia marina (Kützing) M.Schmidt, 1889
Rhoicosphenia marina Aubert, 1894 (uncertain > unassessed )
Rhoicosphenia marina Berg, 1949 (uncertain > unassessed )
Rhoicosphenia marina f. major M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia marina f. marina M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia marina f. minor M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia marina var. heterostricta M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia marina var. intermedia M. Schmidt in Schmidt et al., 1899 (uncertain > unassessed )
Rhoicosphenia marina var. japonica Skvortzow, 1929 (uncertain > unassessed )
Rhoicosphenia michalii R.Ligowski, 2014
Rhoicosphenia oceanicum H. Peragallo in Tempère & Peragallo, 1910 (uncertain > unassessed )
Rhoicosphenia omblaensis Caput Mihalic & Levkov, 2010