Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata
   1 Subclass Randiellata Jamieson, 1988
   2 Subclass Tubificata Jamieson, 1988
   3.1 Subclass Lumbriculata Jamieson, 1988
   3.2 Subclass Diplotesticulata