| Family | Genus | Species |
|---|---|---|
| Alaimidae | 4 | 30 |
| Anoplostomatidae | 2 | 48 |
| Anticomidae | 2 | 31 |
| Campydoridae | 1 | 1 |
| Enchelidiidae | 8 | 53 |
| Enoplidae | 3 | 50 |
| Ironidae | 5 | 49 |
| Lauratonematidae | 1 | 6 |
| Leptosomatidae | 10 | 44 |
| Oncholaimidae | 12 | 212 |
| Oxystominidae | 8 | 173 |
| Phanodermatidae | 5 | 50 |
| Rhabdolaimidae | 1 | 7 |
| Thoracostomopsidae | 10 | 263 |
| Trefusiidae | 4 | 29 |
| Tripyloididae | 2 | 59 |
| Trischistomatidae | 2 | 39 |
| Xennellidae | 1 | 1 |