- Alaimidae
- Campydoridae
- Rhabdolaimidae
- Anoplostomatidae
- Anticomidae
- Enoplidae
- Phanodermatidae
- Thoracostomopsidae
- Ironidae
- Leptosomatidae
- Oxystominidae
- Enchelidiidae
- Oncholaimidae
- Oncholaimoidea
- Thalassogeneridae
- Lauratonematidae
- Simpliconematidae
- Trefusiidae
- Trischistomatidae
- Xenellidae
- Lauratonematidae
- Simpliconematidae
- Trefusiidae
- Trischistomatidae
- Xenellidae
- Tripyloididae