Annelida Lamarck, 1809 - segmented worms
   "polychaetes" see Class Polychaeta Grube, 1850
     Scolecida G.W. Rouse & K. Fauchald, 1997 see Order Scolecida Rouse & Fauchald, 1997
       Family Orbiniidae Hartman, 1942
         Genus Haploscoloplos Monro, 1933
         1 Subfamily Methanoariciinae Blake, 2000a
         2.1 Subfamily Microrbiniinae Blake, 2000a
         2.2 Subfamily Orbiniinae Hartman, 1942