[ref. ID; 1663 (Robert W. Pennak, 1978) (Aquatic earthworms)]
Order Haplotaxida
Family Aeolosomatidae
Genus: Aeolosoma
Family Opistocystidae
Genus: Opistocysta
Family Naididae
Genus: Allonais, Amphichaeta, Arcteonais, Chaetogaster, Dero, Haemonais, Nais, Ophidonais, Paranais, Pristina, Slavina, Specaria, Stylaria, Uncinais, Vejdovskyella
Family Haplotaxidae
Genus: Haplotaxis
Family Enchytraeidae
Family Tubificidae
Genus: Aulodrilus, Bothrioneurum, Branchiura, Clitellio, Ilyodrilus, Isochaeta, Limnodrilus, Monopylephorus, Potamothrix, Psammoryctides, Rhyacodrillus, Telmatodrilus, Tubifex
Family Lumbricidae
Family Megascolecidae
Family Glossoscolecidae
Order Lumbriculida
Family Lumbriculidae
Genus: Eclipidrilus, Kincaidiana, Lumbriculus, Rhynchelmis, Stylodrilus