| Order | Family | Genus | Species |
|---|---|---|---|
| Acanthobdellida | 0 | 2 | 4 |
| Alluroidida | 1 | 1 | 3 |
| Arhynchobdellida | 0 | 0 | 8 |
| Aspidosiphonidormes | 1 | 3 | 38 |
| Branchiobdellida | 3 | 17 | 68 |
| Capilloventrida | 1 | 1 | 7 |
| Crassiclitellata | 16 | 156 | 3351 |
| Echiuroidea | 3 | 18 | 105 |
| Enchytraeida | 2 | 27 | 899 |
| Eunicida | 9 | 76 | 942 |
| Flabelligerida | 0 | 0 | 5 |
| Golfingiida | 4 | 10 | 99 |
| Haplotaxida | 1 | 4 | 1175 |
| Hirudinida | 13 | 87 | 993 |
| Lumbriculida | 5 | 21 | 286 |
| Moniligastrida | 1 | 2 | 59 |
| Myzostomida | 7 | 12 | 109 |
| Narapida | 0 | 0 | 0 |
| Opheliida | 0 | 0 | 6 |
| Parvidrilida | 1 | 1 | 5 |
| Phascolosomatiformes | 1 | 3 | 46 |
| Phyllodocida | 31 | 315 | 4034 |
| Potamodrilidae | 0 | 1 | 1 |
| Randiellida | 1 | 1 | 8 |
| Rhynchobdellida | 1 | 20 | 312 |
| Sabellida | 6 | 127 | 922 |
| Spionida | 6 | 32 | 1010 |
| Terebellida | 11 | 123 | 1484 |
| Tubificida | 3 | 75 | 779 |
| Xenopneusta | 1 | 1 | 6 |