| Family | Genus | Species |
|---|---|---|
| Arcellidae | 3 | 32 |
| Centropyxidae | 1 | 5 |
| Cryptodifflugiidae | 1 | 4 |
| Cylindriflugiidae | 1 | 3 |
| Difflugiidae | 5 | 20 |
| Heleoperidae | 1 | 11 |
| Hyalospheniidae | 16 | 66 |
| Lesquereusiidae | 1 | 4 |
| Netzeliidae | 3 | 11 |
| Phryganellidae | 1 | 4 |
| Plagiopyxidae | 2 | 3 |
| Trigonopyxidae | 1 | 2 |