| 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 |
| Thalassiosira sacketti G.A. Fryxell, 1977 |
| Thalassiosira simonsenii Hasle & G.A. Fryxell, 1977 |
| Thalassiosira subtilis (Ostenf.) Gran, 1900 |
| Thalassiosira symmetrica G.A. Fryxell & Hasle, 1973 |
| Thalassiosira tcherniai Mangin, 1957 |
| Thalassiosira tealata Takano, 1980 |
| Thalassiosira tenera Proshk. -Lavr., 1961 |
| Thalassiosira tubifera G.A. Fryxell, 1975 |
| Thalassiosira visurgis Hust., 1957 |
| Thalassiosiraceae G. Lebour, 1930 |