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