1. Species Thalassiosira baltica (Grunow) Ostenfeld, 1901
2. Species Thalassiosira bioculata (Grunow) Ostenfeld, 1903
3. Species Thalassiosira decipiens (Grunow) E.G.Jørgensen, 1905
4. Species Thalassiosira gravida Cleve, 1896
5. Species Thalassiosira hyalina (Grunow) Gran, 1897
6. Species Thalassiosira hyperborea (Grunow) Hasle in Hasle & Lange, 1989
7. Species Thalassiosira minuscula Krasske, 1941
8. Species Thalassiosira nitzschioides (Grunow) Mereschkowsky, 1902
9. Species Thalassiosira nordenskioeldii Cleve, 1873
10. Species Thalassiosira fluviatilis Hustedt, 1926 accepted as Thalassiosira weissflogii (Grunow) G.Fryxell & Hasle, 1977 accepted as Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (synonym)
11. Species Thalassiosira rotula Meunier, 1910 accepted as Thalassiosira gravida Cleve, 1896 (unaccepted > junior subjective synonym)
12. Species Thalassiosira lacustris (Grunow) Hasle, 1977 represented as Lineaperpetua lacustris (Grunow) Yu, You, Kociolek & Wang, 2024 (homotypic synonym)
13. Species Thalassiosira oestrupii (Ostenfeld) Hasle, 1972 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
14. Species Thalassiosira aestivalis Gran, 1931 (uncertain > unassessed)
15. Species Thalassiosira angulata (W.Gregory) Hasle, 1978 accepted as Orthosira angulata Gregory, 1857 (uncertain > unassessed)
16. Species Thalassiosira anguste-lineata (A.Schmidt) G.Fryxell & Hasle, 1977 accepted as Coscinodiscus angustelineatus Schmidt in Schmidt et al., 1878 (uncertain > unassessed)
17. Species Thalassiosira antarctica Comber, 1896 (uncertain > unassessed)
18. Species Thalassiosira binata Fryxell, 1977 (uncertain > unassessed)
19. Species Thalassiosira bramaputrae (Ehrenberg) Håkansson & Locker, 1981 accepted as Stephanodiscus bramaputrae Ehrenberg, 1854 (uncertain > unassessed)
20. Species Thalassiosira bulbosa Syvertsen in Syvertsen & Hasle, 1984 (uncertain > unassessed)
21. Species Thalassiosira concaviuscula I.V.Makarova, 1978 (uncertain > unassessed)
22. Species Thalassiosira condensata Cleve, 1900 (uncertain > unassessed)
23. Species Thalassiosira conferta Hasle, 1977 (uncertain > unassessed)
24. Species Thalassiosira constricta Gaarder, 1938 accepted as Bacterosira constricta (Gaarder, 1938) J.S. Park & J.H. Lee, 2016 (uncertain > unassessed)
25. Species Thalassiosira curviseriata Takano, 1981 (uncertain > unassessed)
26. Species Thalassiosira delicatula Hustedt, 1958 (uncertain > unassessed)
27. Species Thalassiosira delicatula Ostenfeld, 1908 (uncertain > unassessed)
28. Species Thalassiosira diporocyclus Hasle, 1972 (uncertain > unassessed)
29. Species Thalassiosira eccentrica (Ehrenberg) Cleve, 1904 (uncertain > unassessed)
30. Species Thalassiosira expecta VanLandingham, 1978 (uncertain > unassessed)
31. Species Thalassiosira gracilis (Karsten) Hustedt, 1958 accepted as Coscinodiscus gracilis Karsten, 1905 (uncertain > unassessed)
32. Species Thalassiosira guillardii Hasle, 1978 (uncertain > unassessed)
33. Species Thalassiosira hendeyi Hasle & G.Fryxell, 1977 (uncertain > unassessed)
34. Species Thalassiosira hispida Syvertsen, 1986 (uncertain > unassessed)
35. Species Thalassiosira kryophila (Grunow) E.Jørgensen, 1905 accepted as Coscinodiscus kryophilus Grunow, 1884 (uncertain > unassessed)
36. Species Thalassiosira kushirensis Takano, 1985 (uncertain > unassessed)
37. Species Thalassiosira leptopus (Grunow ex Van Heurck) Hasle & G.Fryxell, 1977 (uncertain > unassessed)
38. Species Thalassiosira levanderi van Goor, 1924 (uncertain > unassessed)
39. Species Thalassiosira mala Takano, 1965 (uncertain > unassessed)
40. Species Thalassiosira mediterranea (Schröder) Hasle, 1972 accepted as Coscinosira mediterranea Schröder, 1911 (uncertain > unassessed)
41. Species Thalassiosira minima Gaarder, 1951 (uncertain > unassessed)
42. Species Thalassiosira nana Lohmann, 1908 (uncertain > unassessed)
43. Species Thalassiosira oceanica Hasle, 1983 (uncertain > unassessed)
44. Species Thalassiosira pacifica Gran & Angst, 1931 (uncertain > unassessed)
45. Species Thalassiosira partheneia Schrader, 1972 (uncertain > unassessed)
46. Species Thalassiosira polychorda (Gran) E.Jorgensen, 1899 accepted as Coscinodiscus polychordus Gran, 1897 (uncertain > unassessed)
47. Species Thalassiosira poroseriata (Ramsfjell) Hasle, 1972 accepted as Coscinosira poroseriata Ramsfjell, 1959 (uncertain > unassessed)
48. Species Thalassiosira proschkinae Makarova, 1979 (uncertain > unassessed)
49. Species Thalassiosira pseudonana Hasle & Heimdal, 1970 (uncertain > unassessed)
50. Species Thalassiosira punctigera (Castracane) Hasle, 1983 accepted as Ethmodiscus punctiger Castracane, 1886 (uncertain > unassessed)
51. Species Thalassiosira rosulata Takano, 1985 (uncertain > unassessed)
52. Species Thalassiosira subsalina Proshkina-Lavrenko, 1955 (uncertain > unassessed)
53. Species Thalassiosira subtilis (Ostenfeld) Gran, 1900 (uncertain > unassessed)
54. Species Thalassiosira tealata Takano, 1980 (uncertain > unassessed)
55. Species Thalassiosira tenera Proschkina-Lavrenko, 1961 (uncertain > unassessed)
56. Species Thalassiosira weissflogii (Grunow) G.Fryxell & Hasle, 1977 accepted as Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (uncertain > unassessed)

marine, brackish, fresh, terrestrial

recent only

Cleve, P.T. (1873). On Diatoms from the Arctic Sea. <em>Bihang till Kongliga Svenska Vetenskaps-Akademiens Handlingar.</em> 1(13): 1-28, 4 pls., available online at https://www.biodiversitylibrary.org/page/14152113#page/541/mode/1up
page(s): 6-7 [details] 

Kociolek, J.P.; Blanco, S.; Coste, M.; Ector, L.; Liu, Y.; Karthick, B.; Kulikovskiy, M.; Lundholm, N.; Ludwig, T.; Potapova, M.; Rimet, F.; Sabbe, K.; Sala, S.; Sar, E.; Taylor, J.; Van de Vijver, B.; Wetzel, C.E.; Williams, D.M.; Witkowski, A.; Witkowski, J. (2025). DiatomBase. Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2025) European Register of Marine Species at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=148912 on 2025-05-07

Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2025). European Register of Marine Species. Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973. Accessed at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=148912 on 2025-05-07

[taxonomic tree]