| Stephanodiscus carconensis Grunow, 1878 |
| Stephanodiscus dubius (Fricke) Round, 1982 |
| Stephanodiscus excentricus Hust., 1952 |
| Stephanodiscus hantzschii Grunow, 1880 |
| Stephanodiscus medius Håkansson, 1986 |
| Stephanodiscus minutulus (Kütz.) Cleve & Möller, 1882 |
| Stephanodiscus neoastraea Håkansson & Hickel, 1986 |
| Stephanodiscus niagarae Ehrenb., 1845 |
| Stephanodiscus niagarae var. magnificus Fricke, 1901 |
| Stephanodiscus oregonicus (Ehrenb.) Håk., 1986 |
| Stephanodiscus parvus Stoermer & Håkansson, 1984 |
| Stephanodiscus rotula (Kütz.) Hendey, 1964 |
| Stephanodiscus subtilis (Goor) A. Cleve, 1951 |
| Stephanodiscus subtransylvanicus Gasse, 1980 |
| Stephanodiscus transylvanicus Pantocsek, 1892 |
| Thalassiosira Cleve, 1873 |
| Thalassiosira aestivalis Gran, 1931 |
| Thalassiosira alleni Tanako, 1965 |
| Thalassiosira angulata (W. Greg.) Hasle, 1978 |
| Thalassiosira anguste-lineata (A. Schmidt) G.A. Fryxell & Hasle, 1977 |