| Order | Family | Genus | Species |
|---|---|---|---|
| Acanthobdellida | 0 | 2 | 4 |
| Alluroidida | 1 | 1 | 3 |
| Arhynchobdellida | 0 | 0 | 8 |
| Branchiobdellida | 3 | 17 | 68 |
| Capilloventrida | 1 | 1 | 7 |
| Crassiclitellata | 16 | 156 | 3354 |
| Enchytraeida | 2 | 27 | 899 |
| Haplotaxida | 1 | 4 | 1175 |
| Hirudinida | 13 | 87 | 994 |
| Lumbriculida | 5 | 21 | 286 |
| Moniligastrida | 1 | 2 | 61 |
| Narapida | 0 | 0 | 0 |
| Parvidrilida | 1 | 1 | 5 |
| Randiellida | 1 | 1 | 8 |
| Rhynchobdellida | 1 | 20 | 313 |
| Tubificida | 3 | 75 | 779 |