| Order | Family | Genus | Species |
|---|---|---|---|
| Acanthoceratales | 1 | 2 | 7 |
| Anaulales | 1 | 3 | 8 |
| Ardissoneales | 1 | 6 | 12 |
| Chaetocerotales | 1 | 2 | 302 |
| Cymatosirales | 2 | 13 | 76 |
| Eucampiales | 1 | 2 | 12 |
| Eupodiscales | 3 | 10 | 46 |
| Hemiaulales | 1 | 1 | 7 |
| Hydroserales | 1 | 2 | 5 |
| Liparogyrales | 2 | 4 | 1 |
| Lithodesmiales | 2 | 9 | 32 |
| Thalassiosirales | 3 | 30 | 524 |
| Trigoniumales | 4 | 5 | 12 |