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 (879)
- Kingdom Animalia (681)
- Kingdom Bacteria (5)
- Kingdom Chromista (179)
- Subkingdom Hacrobia (4)
- Subkingdom Harosa (91)
- Phylum Bacillariophyta
- Phylum Heterokontophyta (84)
- Subphylum Bacillariophytina (84)
- Class Bacillariophyceae (84)
- Subclass Bacillariophyceae incertae sedis
- Subclass Bacillariophycidae (22)
- Subclass Coscinodiscophycidae (57)
- Superorder Biddulphianae (5)
- Superorder Chaetocerotanae (18)
- Superorder Corethranae (1)
- Superorder Coscinodiscanae (16)
- Superorder Cymatosirophycanae
- Superorder Lithodesmiophycanae
- Superorder Rhizosolenianae (7)
- Superorder Thalassiosiranae (10)
- Order Thalassiosirales (10)
- Family Lauderiaceae (Schütt) Lemmermann, 1899, sensu emend.
- Family Skeletonemaceae Lebour, 1930, sensu emend. (1)
- Family Stephanodiscaceae Glezer & Makarova, 1986 (4)
- Family Thalassiosiraceae Lebour, 1930 (5)
- Genus Lineaperpetua Yu, You, Kociolek & Q.Wang (1)
- Genus Microsiphona C.I. Weber, 1970
- Genus Thalassiocyclus H. Håkansson & A. Mahood, 1993
- Genus Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973 (4)
- Species Thalassiosira angstii (Gran) Makarova, 1971 accepted as Coscinodiscus angstii var. angstii Gran in Gran & Angst, 1931
- Species Thalassiosira angulata (W.Gregory) Hasle, 1978 accepted as Orthosira angulata Gregory, 1857
- Species Thalassiosira anguste-lineata (A.Schmidt) G.Fryxell & Hasle, 1977 accepted as Coscinodiscus angustelineatus Schmidt in Schmidt et al., 1878
- Species Thalassiosira antarctica Comber, 1896
- Species Thalassiosira baltica (Grunow) Ostenfeld, 1901
- Species Thalassiosira decipiens (Grunow) E.G.Jørgensen, 1905
- Species Thalassiosira delicatula Ostenfeld, 1908
- Species Thalassiosira eccentrica (Ehrenberg) Cleve, 1904
- Species Thalassiosira gravida Cleve, 1896
- Species Thalassiosira hendeyi Hasle & G.Fryxell, 1977
- Species Thalassiosira lacustris (Grunow) Hasle, 1977 represented as Lineaperpetua lacustris (Grunow) Yu, You, Kociolek & Wang, 2024
- Species Thalassiosira leptopus (Grunow ex Van Heurck) Hasle & G.Fryxell, 1977
- Species Thalassiosira levanderi van Goor, 1924
- Species Thalassiosira minima Gaarder, 1951
- Species Thalassiosira nodulolineata (Hendey) Hasle & Fryxell, 1977 accepted as Coscinodiscus nodulolineatus Hendey, 1958
- Species Thalassiosira nordenskioeldii Cleve, 1873
- Species Thalassiosira pacifica Gran & Angst, 1931
- Species Thalassiosira proschkinae Makarova, 1979
- Species Thalassiosira pseudonana Hasle & Heimdal, 1970
- Species Thalassiosira punctigera (Castracane) Hasle, 1983 accepted as Ethmodiscus punctiger Castracane, 1886
- Species Thalassiosira rotula Meunier, 1910 accepted as Thalassiosira gravida Cleve, 1896
- Species Thalassiosira subtilis (Ostenfeld) Gran, 1900
- Subclass Fragilariophycidae (5)
- Kingdom Plantae (14)
- Kingdom Protozoa