Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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- Biota (12 689)
- Kingdom Animalia (9 795)
- Kingdom Archaea (1)
- Kingdom Bacteria (310)
- Kingdom Chromista (956)
- Subkingdom Chromobiota
- Subkingdom Cryptista accepted as Cryptophyta
- Subkingdom Hacrobia (58)
- Subkingdom Harosa (627)
- Phylum Bacillariophyta
- Phylum Heterokontophyta (271)
- Subphylum Bacillariophytina (271)
- Class Bacillariophyceae (271)
- Subclass Bacillariophyceae incertae sedis (2)
- Subclass Bacillariophycidae (168)
- Superorder Bacillariophycanae (167)
- Order Achnanthales (18)
- Order Bacillariales (35)
- Family Bacillariaceae Ehrenberg, 1831 (35)
- Genus Bacillaria J.F. Gmelin, 1788
- Genus Cylindrotheca L. Rabenhorst, 1859 (1)
- Genus Denticula F.T. Kützing, 1844
- Genus Denticulopsis R. Simonsen, 1979
- Genus Fragilariopsis F. Hustedt in A. Schmidt et al., 1913 (4)
- Genus Hantzschia A. Grunow, 1877 (3)
- Genus Nitzschia A.H. Hassall, 1845 (18)
- Species Nitzschia acicularis (Kützing) W.Smith, 1853
- Species Nitzschia acicularis Frenguelli, 1923
- Species Nitzschia amphibia Grunow, 1862
- Species Nitzschia amphioxys (Ehrenberg) W.Smith, 1853 accepted as Hantzschia amphioxys (Ehrenberg) Grunow, 1880
- Species Nitzschia angulata Hasle, 1972
- Species Nitzschia angustata (W.Smith) Grunow, 1880 accepted as Tryblionella angustata var. angustata W. Smith, 1853
- Species Nitzschia angustata sensu Fontell, 1917
- Species Nitzschia antarctica Okuno, 1954
- Species Nitzschia australis (Peragallo) A.Mann, 1937 accepted as Nitzschia dubia var. australis Peragallo, 1921
- Species Nitzschia barbieri M. Peragallo, 1921 accepted as Fragilariopsis barbieri (M. Peragallo) Cefarelli, Ferrario & Lundholm, 2021
- Species Nitzschia barronii Gersonde, 1991
- Species Nitzschia bicapitata Cleve, 1901
- Species Nitzschia braarudii G.R.Hasle, 1960
- Species Nitzschia brebissoni
- Species Nitzschia closterium (Ehrenberg) W.Smith, 1853
- Species Nitzschia closterium Eulenstein, 1868
- Species Nitzschia commutata Grunow, 1880
- Species Nitzschia compacta Hustedt, 1958
- Species Nitzschia compressa (Bailey) C.S.Boyer, 1916 accepted as Tryblionella compressa (J.W.Bailey) M.Poulin, 1990
- Species Nitzschia constricta (Gregory) Grunow, 1880 accepted as Psammodictyon constrictum f. parvum (Grunow) Belegratis, Louvrou & Economou-Amilli, 2012
- Species Nitzschia curta (Van Heurck) Hasle, 1972 accepted as Fragilaria curta Van Heurck, 1909
- Species Nitzschia cylindrus (Grunow) Hasle, 1972
- Species Nitzschia decipiens Hustedt, 1958
- Species Nitzschia directa Pantocsek, 1902
- Species Nitzschia dissipata (Kützing) Rabenhorst, 1860 accepted as Synedra dissipata var. dissipata Kützing, 1844
- Species Nitzschia dubia W.Smith, 1853
- Species Nitzschia elongata Hassal, 1845 accepted as Nitzschia sigmoidea (Nitzsch) W.Smith, 1853
- Species Nitzschia filiformis (W.Smith) Hustedt
- Species Nitzschia filiformis Hajós, 1959
- Species Nitzschia fonticola (Grunow) Grunow, 1881
- Species Nitzschia frustulum (Kützing) Grunow, 1880
- Species Nitzschia gracilis Hantzsch, 1860
- Species Nitzschia gracilis (Brébisson in Kützing)
- Species Nitzschia homburgiensis Lange-Bertalot, 1978
- Species Nitzschia inflatula G.R.Hasle, 1974
- Species Nitzschia interfrigidaria McColloum emend Ciesielski, 1983
- Species Nitzschia kerguelensis (O'Meara) Hasle, 1965 accepted as Terebraria kerguelensis E.O'Meara, 1876 †
- Species Nitzschia lecointei van Heurck, 1909
- Species Nitzschia linearis W.Smith, 1853
- Species Nitzschia lineola Cleve, 1897
- Species Nitzschia littoralis Grunow, 1880 accepted as Tryblionella littoralis (Grunow) D.G.Mann, 1990
- Species Nitzschia longissima (Brébisson) Ralfs, 1861
- Species Nitzschia marginulata Grunow, 1880
- Species Nitzschia medioconstricta Hustedt, 1958
- Species Nitzschia microcephala Grunow, 1878
- Species Nitzschia minuta Bleisch, 1863
- Species Nitzschia minutissima W.Smith, 1853
- Species Nitzschia obliquecostata (Van Heurck) Hasle, 1972 accepted as Fragilaria obliquecostata f. obliquecostata Van Heurck, 1909
- Species Nitzschia obtusa W.Smith, 1853
- Species Nitzschia palea (Kützing) W.Smith, 1856
- Species Nitzschia peragallii Hasle, 1965
- Species Nitzschia perminuta (Grunow) M.Peragallo, 1903
- Species Nitzschia praecurta Gersonde, 1991
- Species Nitzschia praeinterfrigidaria McCollum, 1975
- Species Nitzschia praeinterfrigidaria McCollum emend Ciesielski, 1983
- Species Nitzschia pseudonana Hasle, 1974
- Species Nitzschia punctata L.W. Bailey, 1861
- Species Nitzschia ritscheri (Hustedt) Hasle, 1972 accepted as Fragilariopsis ritscheri Hustedt, 1958
- Species Nitzschia romana Grunow, 1881 accepted as Nitzschia palea var. romana Grunow, 1880
- Variety Nitzschia romana var. romana Grunow in Van Heurck, 1881
- Species Nitzschia scalpelliformis Grunow, 1880
- Species Nitzschia separanda (Hustedt) Hasle, 1972 accepted as Fragilariopsis separanda Hustedt, 1958
- Species Nitzschia sicula (Castracane) Hustedt
- Species Nitzschia sigmoidea (Nitzsch) W.Smith, 1853
- Species Nitzschia spectabilis (Ehrenberg) Ralfs, 1861
- Species Nitzschia spectabilis W. Smith, 1853
- Species Nitzschia stellata Manguin, 1957
- Species Nitzschia subcurvata G.R.Hasle, 1964
- Species Nitzschia sublinearis Hustedt, 1930
- Species Nitzschia subtilis (Kützing) Grunow, 1880 accepted as Nitzschia linearis var. subtilis (Grunow) Hustedt, 1923
- Species Nitzschia taenia W.Smith, 1853
- Species Nitzschia turgidula Hustedt, 1958
- Species Nitzschia umbonata (Ehrenberg) Lange-Bertalot, 1978 accepted as Navicula umbonata Ehrenberg, 1837
- Species Nitzschia vermicularis (Kützing) Hantzsch, 1860 accepted as Frustulia vermicularis Kützing, 1833
- Species Nitzschia vivax W.Smith
- Species Nitzschia vivax Hantzsch, 1860
- Species Nitzschia westii Kellogg, Stuiver, et al., 1980
- Genus Psammodictyon D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990
- Genus Pseudoeunotia accepted as Pseudo-eunotia A. Grunow in H. Van Heurck, 1881
- Genus Pseudonitzschia accepted as Pseudo-nitzschia H. Peragallo in H. Peragallo & M. Peragallo, 1900
- Genus Pseudo-nitzschia H. Peragallo in H. Peragallo & M. Peragallo, 1900 (7)
- Genus Tryblionella W. Smith, 1853 (2)
- Order Cymbellales (14)
- Order Lyrellales
- Order Mastogloiales (1)
- Order Naviculales (84)
- Order Rhopalodiales (4)
- Order Surirellales (3)
- Order Thalassiophysales (8)
- Superorder Bacillariophycidae incertae sedis
- Superorder Eunotiophycanae (1)
- Subclass Coscinodiscophycidae (67)
- Subclass Fragilariophycidae (34)
- Phylum Xanthophyta accepted as Xanthophyceae
- Kingdom Fungi (740)
- Kingdom Plantae (822)
- Kingdom Protozoa (65)
