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)
- 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
- Species Nitzschiella acicularis (Kützing) Rabenhorst, 1864 accepted as Nitzschia acicularis (Kützing) W.Smith, 1853
- Species Nitzschiella biplacata
- Species Nitzschiella californica Mereschkowsky, 1901
- Species Nitzschiella closterioides (Grunow) Schumann, 1867 accepted as Nitzschia acicularis var. closterioides Grunow, 1862
- Species Nitzschiella closterium (Ehrenberg) Rabenhorst, 1864 accepted as Ceratoneis closterium Ehrenberg, 1839
- Species Nitzschiella compressa Mereschkowsky, 1902
- Species Nitzschiella gracilis (Brébisson ex Kützing) Rabenhorst, 1864 accepted as Ceratoneis gracilis Brébisson ex Kützing, 1849
- Species Nitzschiella hamata (W. Smith) Rabenhorst, 1864 accepted as Synedra hamata W.Smith, 1853
- Species Nitzschiella incerta (Grunow in Cleve & Grunow) Peragallo & Peragallo, 1900 accepted as Nitzschia lorenziana var. incerta Grunow in Cleve & Grunow, 1880
- Species Nitzschiella incurva
- Species Nitzschiella lecointei
- Species Nitzschiella longissima (Brébisson) Rabenhorst accepted as Nitzschia longissima (Brébisson) Ralfs, 1861
- Species Nitzschiella lorensiana
- Species Nitzschiella membranacea Mereschkowsky, 1902
- Species Nitzschiella reversa
- Species Nitzschiella spiralis (Kützing) Rabenhorst, 1864 accepted as Ceratoneis spiralis Kützing, 1844
- Species Nitzschiella subulata (Brébisson in Kützing) Rabenhorst, 1864 accepted as Ceratoneis subulata Brébisson in Kutzing, 1846
- Species Nitzschiella taenia Rabenhorst
- Species Nitzschiella tenuirostris Mereschkowsky, 1901 accepted as Cylindrotheca closterium (Ehrenberg) Reimann & J.C.Lewin, 1964
- Variety Nitzschiella tenuirostris var. arcus Mereschkowsky, 1901
- Variety Nitzschiella tenuirostris var. genuina Mereschkowsky, 1901
- Variety Nitzschiella tenuirostris var. hamulifera Mereschkowsky, 1901
- Forma Nitzschiella tenuirostris f. directa Mereschkowsky, 1901
- Forma Nitzschiella tenuirostris f. directa Mereschkowsky, 1902
- Forma Nitzschiella tenuirostris f. minutissima Mereschkowsky, 1901
- Forma Nitzschiella tenuirostris f. parva Mereschkowsky, 1901
- Forma Nitzschiella tenuirostris f. semicircularis Mereschkowsky, 1902
- Forma Nitzschiella tenuirostris f. semicircularis Mereschkowsky, 1902
- Forma Nitzschiella tenuirostris f. tenuirostris Mereschkowsky, 1901
- 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
