| Thalassiosira minima Gaarder, 1951 |
| Thalassiosira minuscula Krasske, 1941 |
| Thalassiosira monoporocyclus Hasle, 1972 |
| Thalassiosira nanolineata (Mann) G.A. Fryxell & Hasle, 1977 |
| Thalassiosira nordenskioeldii Cleve, 1873 |
| Thalassiosira oceanica Hasle, 1983 |
| Thalassiosira oestrupii (Ostenf.) Hasle, 1960 |
| Thalassiosira oestrupii var. venrickae G.A. Fryxell & Hasle, 1980 |
| Thalassiosira oliveriana (O'Meara) I.V. Makarova & V.A. Nikolajev, 1983 |
| Thalassiosira pacifica Gran & Angst, 1931 |
| Thalassiosira partheneia H.-J. Schrad., 1972 |
| Thalassiosira parva Proshk. -Lavr., 1955 |
| Thalassiosira plicata Schrader, 1974 |
| Thalassiosira polychorda (Gran) Jørg., 1899 |
| Thalassiosira poro-irregulata Hasle & Heimdal, 1970 |
| Thalassiosira profunda (Hendey) Hasle, 1973 |
| Thalassiosira pseudonana Hasle & Heimdal, 1970 |
| Thalassiosira punctifera (Grunow) G.A. Fryxell, Simonsen & Hasle, 1974 |
| Thalassiosira punctigera (Castrac.) Hasle, 1983 |
| Thalassiosira rotula Meunier, 1910 |