| Family | Genus | Species |
|---|---|---|
| Anaulaceae | 3 | 8 |
| Ardissoneaceae | 3 | 6 |
| Bellerocheaceae | 2 | 8 |
| Biddulphiaceae | 9 | 27 |
| Cymatosiraceae | 12 | 73 |
| Eupodiscaceae | 4 | 6 |
| Hemiaulaceae | 4 | 20 |
| Lithodesmiaceae | 4 | 20 |
| Odontellaceae | 3 | 30 |
| Parodontellaceae | 1 | 5 |
| Plagiogrammaceae | 8 | 50 |
| Toxariaceae | 1 | 2 |
| Triceratiaceae | 2 | 12 |