Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata Subclass Diplotesticulata Superorder Metagynophora Jamieson, 1988 Order Opisthopora Suborder Crassiclitellata 1 Cohort Aquamegadrili Jamieson, 1988 2 Cohort Terrimegadrili Jamieson, 1988