| Thalassiosira hyalina (Grunow) Gran, 1897 |
| Thalassiosira intrannula Herzig & G.A. Fryxell, 1986 |
| Thalassiosira lacustris (Grunow) Hasle, 1977 |
| Thalassiosira leptopus (Grunow) Hasle & G.A. Fryxell, 1977 |
| Thalassiosira lineata Jousé, 1964 |
| Thalassiosira lineoides Herzig & G.A. Fryxell, 1986 |
| Thalassiosira lundiana G.A. Fryxell, 1975 |
| Thalassiosira mala Takano, 1965 |
| Thalassiosira mediterranea (Schröd.) Hasle, 1972 |
| Thalassiosira mendiolana Hasle & Heimdal, 1970 |
| 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 |