Annelida Lamarck, 1809 - segmented worms
   Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata
     Order Opisthopora
       Family Megascolecidae Rosa, 1891
         1 Genus [Amynthas] Kinberg, 1867
         2 Genus [Lampito] Kinberg, 1867
         3 Genus [Metaphire] Sims & Easton, 1972
         4 Genus [Perionyx] Perrier, 1872
         5 Genus [Polypheretima] Michaelsen, 1934