DiatomBase
Between brackets is the number of accepted extant species
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- Bacillariophyceae (5 957)
- Subclass Bacillariophyceae incertae sedis (189)
- Subclass Bacillariophycidae (4 408)
- Superorder Bacillariophycanae (4 083)
- Order Achnanthales (438)
- Order Bacillariales (357)
- Family Bacillariaceae Ehrenberg, 1831 (352)
- Genus Allonitzschia A. Mann, 1925
- Genus Alveus I. Kaczmarska & G.A. Fryxell, 1996
- Genus Bacillaria J.F. Gmelin, 1788 (3)
- Genus Cylindrotheca L. Rabenhorst, 1859 (2)
- Genus Cymatonitzschia R. Simonsen, 1974
- Genus Cymbellonitzschia F. Hustedt in A. Schmidt et al., 1924 (1)
- Genus Denticula F.T. Kützing, 1844 (6)
- Genus Denticulopsis R. Simonsen, 1979 (1)
- Species Denticulopsis barronii Yanagisawa & Akiba, 1990
- Species Denticulopsis crassa Yanagisawa & Akiba, 1990
- Species Denticulopsis delicata Yanagisawa & Akiba, 1990
- Species Denticulopsis dimorpha (Schrader) Simonsen, 1979 accepted as Denticula dimorpha Schrader, 1973
- Species Denticulopsis hustedtii (R.Simonsen ex T.Kanaya) R.Simonsen † accepted as Denticula hustedtii R.Simonsen ex T.Kanaya
- Species Denticulopsis hyalina (Schrader) Simonsen, 1979 accepted as Denticula hyalina Schrader, 1973
- Species Denticulopsis ichikawae Yanagisawa & Akiba, 1990
- Species Denticulopsis kamtschatica (Zabelina) Simonsen, 1979 accepted as Denticula kamtschatica M.M. Zabelina, 1934
- Species Denticulopsis kanayae (Akiba) Barron, 1985 accepted as Denticula kanayae Akiba, 1977
- Species Denticulopsis katayamae Maruyama, 1984
- Species Denticulopsis katayamae Maruyama emend Yanagisawa & Akiba, 1990
- Species Denticulopsis lauta (Bailey) Simonsen, 1979 accepted as Denticula lauta Bailey, 1854
- Species Denticulopsis maccollumii Simonsen, 1979
- Species Denticulopsis meridionalis Maruyama in Harwood & Maruyama, 1992 †
- Species Denticulopsis miocaenica (Schrader) Simonsen, 1979 accepted as Denticula miocenica Schrader, 1973
- Species Denticulopsis miocenica (Schrader) Simonsen emend Yanagisawa & Akiba, 1990
- Species Denticulopsis nicobarica (Grunow) Simonsen, 1979 accepted as Denticula nicobarica Grunow, 1868
- Species Denticulopsis norvegica (Schrader) Simonsen, 1979 accepted as Denticula norwegica Schrader in Schrader & Fenner, 1976
- Species Denticulopsis okunoi Yanagisawa & Akiba, 1990
- Species Denticulopsis ovata (Schrader) Yanagisawa & Akiba, 1990 accepted as Denticula hustedtii var. ovata Schrader, 1976
- Species Denticulopsis praedimorpha (F. Akiba) J.A. Barron, 1981 † accepted as Denticula praedimorpha Akiba, 1979
- Species Denticulopsis praedimorpha J.A.Barron ex F.Akiba
- Species Denticulopsis praehyalina Tanimura, 1989 †
- Species Denticulopsis praekatayamae Yanagisawa & Akiba, 1990
- Species Denticulopsis praelauta Akiba & Koizumi in Akiba, 1985 †
- Species Denticulopsis punctata (Schrader) Simonsen, 1979 accepted as Denticula punctata Schrader, 1973
- Forma Denticulopsis punctata f. hustedtii (Schrader) Simonsen, 1979 accepted as Denticula punctata f. hustedtii Schrader, 1973
- Species Denticulopsis seminae (Simonsen & Kanaya) Simonsen, 1979 † accepted as Denticula seminae R.Simonsen & T.Kanaya, 1961
- Species Denticulopsis simonsenii Yanagisawa & Akiba, 1990
- Species Denticulopsis tanimurae Yanagisawa & Akiba, 1990
- Species Denticulopsis vulgaris (Okuno) Yanagisawa & Akiba, 1990 accepted as Denticula lauta var. vulgaris Okuno in Helmcke-Krieger, 1964
- Genus Fragilariopsis F. Hustedt in A. Schmidt et al., 1913 (6)
- Genus Gomphonitzschia A. Grunow, 1868 (1)
- Genus Gomphotheca N.I. Hendey & P.A. Sims, 1982
- Genus Hantzschia A. Grunow, 1877 (28)
- Genus Neodenticula Akiba & Yanagisawa, 1986 †
- Genus Nitschia
- Genus Nitzschia A.H. Hassall, 1845 (241)
- Genus Nitzschiella L. Rabenhorst, 1864
- Genus Ophidocampa C.G. Ehrenberg, 1870
- Genus Perrya F. Kitton, 1874 †
- Genus Psammodictyon D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (3)
- Genus Pseudoeunotia accepted as Pseudo-eunotia A. Grunow in H. Van Heurck, 1881
- Genus Pseudo-nitschia accepted as Pseudo-nitzschia H. Peragallo in H. Peragallo & M. Peragallo, 1900
- Genus Pseudonitzschia accepted as Pseudo-nitzschia H. Peragallo in H. Peragallo & M. Peragallo, 1900 (1)
- Genus Pseudo-nitzschia H. Peragallo in H. Peragallo & M. Peragallo, 1900 (48)
- Genus Simonsenia H. Lange-Bertalot, 1979 (2)
- Genus Tryblionella W. Smith, 1853 (9)
- Family Bacillariales incertae sedis (5)
- Family Nitzschiaceae accepted as Bacillariaceae Ehrenberg, 1831
- Order Cymbellales (792)
- Order Dictyoneidales
- Order Lyrellales (15)
- Order Mastogloiales (88)
- Order Naviculales (2 077)
- Order Rhopalodiales (37)
- Order Surirellales (174)
- Order Thalassiophysales (105)
- Superorder Bacillariophycidae incertae sedis (32)
- Superorder Eunotiophycanae (293)
- Subclass Coscinodiscophycidae (877)
- Subclass Fragilariophycidae (483)
- Order Centrales
