Articulata Cuvier see [unranked] Protostomia Grobben, 1908
   Annelida Lamarck, 1809 - segmented worms see Phylum Annelida Lamarck, 1809
     Polychaeta see Class Polychaeta Grube, 1850
       1 Scolecida G.W. Rouse & K. Fauchald, 1997 see Order Scolecida Rouse & Fauchald, 1997
       2 Palpata G.W. Rouse & K. Fauchald, 1997
       3 Family Aeolosomatidae Beddard, 1895
       4 Family Potamodrilidae
       5 Family Parerogodrilidae nom. null. see Family Parergodrilidae Reisinger, 1960
       6 Family Psammodrilidae Swedmark, 1953