Articulata Cuvier see [unranked] Protostomia Grobben, 1908
   Annelida Lamarck, 1809 - segmented worms see Phylum Annelida Lamarck, 1809
     Polychaeta see Class Polychaeta Grube, 1850
       Scolecida G.W. Rouse & K. Fauchald, 1997 see Order Scolecida Rouse & Fauchald, 1997
         1.1.1.1.1.1 Family Arenicolidae Johnston, 1835
         1.1.1.1.1.2 Family Maldanidae Malmgren, 1867 - bamboo worms
         1.1.1.1.2 Family Capitellidae Grube, 1862
         1.1.1.2 Family Opheliidae Malmgren, 1867
         1.1.2 Family Scalibregmatidae Malmgren, 1867
         1.2.1.1 Family Orbiniidae Hartman, 1942
         1.2.1.2 Family Paraonidae Cerruti, 1909
         1.2.2 Family Questidae O. Hartman, 1966
         2 Family Cossuridae Day, 1963