| Family | Genus | Species |
|---|---|---|
| Cyclophoraceae | 3 | 8 |
| Fragilariaceae | 26 | 204 |
| Grammatophoraceae | 4 | 12 |
| Licmophoraceae | 2 | 22 |
| Protoraphidaceae | 2 | 3 |
| Rhabdonemataceae | 1 | 6 |
| Rhaphoneidaceae | 3 | 17 |
| Staurosiraceae | 8 | 44 |
| Striatellaceae | 4 | 10 |
| Tabellariaceae | 2 | 5 |
| Thalassionemataceae | 2 | 21 |
| Ulnariaceae | 8 | 54 |