[ref. ID; 1663 (Robert W. Pennak, 1978)]
Order Chromadorida
Genus: Achromadora, Chromadorita, Ethmolaimus, Monochromadora, Paracyatholaimus, Punctodora
Order Araeolaimida
Genus: Anaplectus, Anonchus, Aphanolaimus, Bastiania, Chronogaster, Cylindrolaimus, Euteratocephalus, Paraphanolaimus, Plectus, Teratocephalus
Order Monhysterida
Genus: Monhystera, Monhystrella, Odontolaimus
Order Desmodorida
Genus: Prodesmodora
Order Enoplida
Genus: Cryptonchus, Ironus, Oncholaimus, Prismatolaimus, Rhabolaimus, Tobrilus, Tripyla
Order Dorylaimida
Genus: Actinolaimus, Alaimus, Amphidelus, Aulolaimoides, Dorylaimus, Eudorylaimus, Labronema, Mesodorylaimus, Microlaimus, Nygolaimus, Thornia
Order Mononchida
Genus: Anatonchus, Miconchus, Mononchulus, Mononchus, Mylonchulus, Prionchulus
Order Tylenchida
Genus: Apelenchoides, Atylenchus, Criconema, Criconemoides, Hemicycliophora, Hirschmanniella, Tylenchus
Order Rhabditida
Genus: Acrobeloides, Butlerius, Cephalobus, Eucephalobus, Goffartia, Mononchoides, Panagrolaimus, Rhabditis