is a biological genus in the family Naididae (Aquatic Oligochaete Worm) and order Tubificida (Aquatic Oligochaete Worm).
Psammoryctides
Specaria
Tubifex
Tasserkidrilus
Arcteonais
Arctodrilus
Kopilrok
Peloscolex
Ripistes
Isochaetides
Alexandrovia
Chaetogaster
Potamothrix
Pristina
Stephensoniana
Spirosperma
Paranais
Thalassodrilus
Ophidonais
Rhyacodrilus
Rhizodrilus
Uncinais
Limnodrilus
Amphichaeta
Branchiura
Quistadrilus
Allonais
Varichaetadrilus
Gianius
Teneridrilus
Bratislavia
Stylaria
Vejdovskyella
Bothrioneurum
Slavina
Haemonais
Aulodrilus
Telmatodrilus
Piguetiella
Ilyodrilus