| 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 | 3368 |
| Echiuroidea | 3 | 18 | 106 |
| Enchytraeida | 2 | 27 | 905 |
| Eunicida | 9 | 77 | 946 |
| Flabelligerida | 0 | 0 | 5 |
| Golfingiida | 4 | 10 | 100 |
| Haplotaxida | 1 | 4 | 1175 |
| Hirudinida | 13 | 87 | 995 |
| Lumbriculida | 5 | 21 | 286 |
| Moniligastrida | 1 | 2 | 61 |
| Myzostomida | 7 | 12 | 110 |
| Narapida | 0 | 0 | 0 |
| Opheliida | 0 | 0 | 6 |
| Parvidrilida | 1 | 1 | 5 |
| Phascolosomatiformes | 1 | 3 | 46 |
| Phyllodocida | 31 | 318 | 4064 |
| Potamodrilidae | 0 | 1 | 1 |
| Randiellida | 1 | 1 | 8 |
| Rhynchobdellida | 1 | 20 | 315 |
| Sabellida | 6 | 127 | 929 |
| Spionida | 6 | 32 | 1013 |
| Terebellida | 11 | 124 | 1513 |
| Tubificida | 3 | 75 | 779 |
| Xenopneusta | 1 | 1 | 6 |