| Family | Genus | Species |
|---|---|---|
| Cyclophoraceae | 4 | 10 |
| Fragilariaceae | 26 | 208 |
| Grammatophoraceae | 4 | 12 |
| Licmophoraceae | 2 | 25 |
| Protoraphidaceae | 2 | 3 |
| Rhabdonemataceae | 1 | 6 |
| Rhaphoneidaceae | 3 | 18 |
| Staurosiraceae | 8 | 46 |
| Striatellaceae | 4 | 10 |
| Tabellariaceae | 2 | 6 |
| Thalassionemataceae | 4 | 24 |
| Ulnariaceae | 8 | 56 |