1. Species Thalassiosira baltica (Grunow) Ostenfeld, 1901
2. Species Thalassiosira gerloffii Rivera, 1981
3. Species Thalassiosira gravida Cleve, 1896
4. Species Thalassiosira oestrupii (Ostenfeld) Hasle, 1972 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
5. Species Thalassiosira ambigua O.G.Kozlova, 1962 (uncertain > unassessed)
6. Species Thalassiosira antarctica Comber, 1896 (uncertain > unassessed)
7. Species Thalassiosira australis M.Peragallo, 1921 (uncertain > unassessed)
8. Species Thalassiosira dichotomica (O.G.Kozlova) G.A.Fryxell & G.R.Hasle, 1983 accepted as Porosira dichotomica O.G.Kozlova, 1962 (uncertain > unassessed)
9. Species Thalassiosira eccentrica (Ehrenberg) Cleve, 1904 (uncertain > unassessed)
10. Species Thalassiosira expecta VanLandingham, 1978 (uncertain > unassessed)
11. Species Thalassiosira ferelineata Hasle & G.A.Fryxell, 1977 (uncertain > unassessed)
12. Species Thalassiosira frenguellii O.G.Kozlova, 1964 (uncertain > unassessed)
13. Species Thalassiosira frenguelliopsis G.A.Fryxell & J.R.Johans, 1985 (uncertain > unassessed)
14. Species Thalassiosira gracilis (Karsten) Hustedt, 1958 accepted as Coscinodiscus gracilis Karsten, 1905 (uncertain > unassessed)
15. Species Thalassiosira lentiginosa (Janisch) Fryxell, 1977 accepted as Coscinodiscus lentiginosus var. lentiginosus Janisch in Schmidt et al., 1878 (uncertain > unassessed)
16. Species Thalassiosira leptopus (Grunow ex Van Heurck) Hasle & G.Fryxell, 1977 (uncertain > unassessed)
17. Species Thalassiosira maculata G.A.Fryxell & J.R.Johansen, 1985 (uncertain > unassessed)
18. Species Thalassiosira margaritae (Frenguelli & Orlando) O.G.Kozlova, 1962 accepted as Coscinodiscus margaritae Frenguelli & Orlando, 1958 (uncertain > unassessed)
19. Species Thalassiosira oliveriana (O'Meara) I.V.Makarova & V.A.Nikolajev, 1983 (uncertain > unassessed)
20. Species Thalassiosira partheneia Schrader, 1972 (uncertain > unassessed)
21. Species Thalassiosira perpusilla Kozlova, 1967 (uncertain > unassessed)
22. Species Thalassiosira poro-irregulata Hasle & Heimdal, 1970 (uncertain > unassessed)
23. Species Thalassiosira poroseriata (Ramsfjell) Hasle, 1972 accepted as Coscinosira poroseriata Ramsfjell, 1959 (uncertain > unassessed)
24. Species Thalassiosira ritscheri (Hustedt) Hasle, 1970 accepted as Coscinodiscus ritscheri Hustedt, 1958 (uncertain > unassessed)
25. Species Thalassiosira scotia Fryxell & Hoban, 1979 (uncertain > unassessed)
26. Species Thalassiosira symmetrica G.A.Fryxell & Hasle, 1973 (uncertain > unassessed)
27. Species Thalassiosira trifulta G.Fryxell, 1979 (uncertain > unassessed)
28. Species Thalassiosira tumida (Janisch) Hasle, 1971 accepted as Coscinodiscus tumidus var. tumidus Janisch in Schmidt et al., 1878 (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. (2024). DiatomBase. Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973. Accessed through: De Broyer, C.; Clarke, A.; Koubbi, P.; Pakhomov, E.; Scott, F.; Vanden Berghe, E. and Danis, B. (Eds.) (2024) Register of Antarctic Marine Species at: https://www.marinespecies.org/rams./aphia.php?p=taxdetails&id=148912 on 2025-04-05

De Broyer, C.; Clarke, A.; Koubbi, P.; Pakhomov, E.; Scott, F.; Vanden Berghe, E. and Danis, B. (Eds.) (2025). Register of Antarctic Marine Species. Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973. Accessed at: https://www.marinespecies.org/rams/aphia.php?p=taxdetails&id=148912 on 2025-04-05

[taxonomic tree]