| Order | Family | Genus | Species |
|---|---|---|---|
| Achnanthales | 0 | 0 | 1 |
| Anaulales | 1 | 3 | 8 |
| Ardissoneales | 1 | 2 | 5 |
| Asterolamprales | 1 | 2 | 2 |
| Bacillariales | 1 | 14 | 624 |
| Biddulphiales | 1 | 7 | 29 |
| Chaetocerotales | 3 | 4 | 362 |
| Chrysanthemodiscales | 1 | 1 | 2 |
| Climacospheniales | 0 | 1 | 3 |
| Cocconeidales | 2 | 10 | 84 |
| Corethrales | 1 | 1 | 9 |
| Coscinodiscales | 4 | 9 | 77 |
| Cyclophorales | 1 | 3 | 8 |
| Cymatosirales | 1 | 12 | 75 |
| Cymbellales | 4 | 21 | 280 |
| Ethmodiscales | 1 | 1 | 1 |
| Eunotiales | 1 | 3 | 48 |
| Eupodiscales | 3 | 8 | 41 |
| Fragilariales | 2 | 33 | 265 |
| Hemiaulales | 2 | 6 | 27 |
| Leptocylindrales | 1 | 2 | 14 |
| Licmophorales | 2 | 10 | 75 |
| Lithodesmiales | 1 | 4 | 21 |
| Lyrellales | 1 | 2 | 5 |
| Mastogloiales | 2 | 5 | 72 |
| Melosirales | 5 | 6 | 43 |
| Naviculales | 15 | 65 | 922 |
| Paraliales | 2 | 2 | 16 |
| Protoraphidales | 1 | 2 | 3 |
| Rhabdonematales | 2 | 5 | 20 |
| Rhaponeidales | 1 | 3 | 17 |
| Rhizosoleniales | 1 | 7 | 44 |
| Rhopalodiales | 1 | 3 | 24 |
| Stephanodiscales | 1 | 6 | 131 |
| Stictocyclales | 1 | 1 | 1 |
| Striatellales | 1 | 5 | 10 |
| Surirellales | 2 | 8 | 88 |
| Tabellariales | 1 | 2 | 6 |
| Thalassionemales | 1 | 2 | 21 |
| Thalassiophysales | 2 | 4 | 108 |
| Thalassiosirales | 3 | 13 | 371 |
| Toxariales | 1 | 1 | 2 |
| Triceratiales | 2 | 10 | 64 |