| Order | Family | Genus | Species |
|---|---|---|---|
| Asterolamprales | 1 | 2 | 5 |
| Chaetocerotales | 3 | 4 | 376 |
| Chrysanthemodiscales | 1 | 1 | 3 |
| Corethrales | 1 | 1 | 9 |
| Coscinodiscales | 4 | 10 | 82 |
| Ethmodiscales | 1 | 1 | 1 |
| Leptocylindrales | 1 | 2 | 14 |
| Liparogyrales | 1 | 1 | 1 |
| Melosirales | 5 | 6 | 46 |
| Paraliales | 2 | 2 | 17 |
| Rhizosoleniales | 1 | 8 | 43 |
| Stephanodiscales | 1 | 6 | 134 |
| Stictocyclales | 1 | 1 | 1 |
| Thalassiosirales | 3 | 14 | 375 |