Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata Subclass Diplotesticulata Superorder Metagynophora Jamieson, 1988 Order Opisthopora Suborder Crassiclitellata Cohort Aquamegadrili Jamieson, 1988 Superfamily Almoidea 1 Family Almidae Duboscq, 1902 2 Family Lutodrilidae McMahan, 1976