Annelida Lamarck, 1809 - segmented worms Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata Order Opisthopora Family Megascolecidae Rosa, 1891 Genus [Perionyx] Perrier, 1872 1 Perionyx excavatus Perrier, 1872 2 Perionyx horai Stephenson, 1924 3 Perionyx modestus Stephenson, 1922 4 Perionyx simlaensis Michaelsen, 1907