Articulata Cuvier see [unranked] Protostomia Grobben, 1908
Count: -
   Annelida Lamarck, 1809 - segmented worms see Phylum Annelida Lamarck, 1809
  Count: -
     Polychaeta see Class Polychaeta Grube, 1850
    Count: [f] 83f
       Scolecida G.W. Rouse & K. Fauchald, 1997 see Order Scolecida Rouse & Fauchald, 1997
      Count: -
         1.1.1.1.1.1 Family Arenicolidae Johnston, 1835
        Count: -
         1.1.1.1.1.2 Family Maldanidae Malmgren, 1867 - bamboo worms
        Count: -
         1.1.1.1.2 Family Capitellidae Grube, 1862
        Count: -
         1.1.1.2 Family Opheliidae Malmgren, 1867
        Count: -
         1.1.2 Family Scalibregmatidae Malmgren, 1867
        Count: -
         1.2.1.1 Family Orbiniidae Hartman, 1942
        Count: -
         1.2.1.2 Family Paraonidae Cerruti, 1909
        Count: -
         1.2.2 Family Questidae O. Hartman, 1966
        Count: -
         2 Family Cossuridae Day, 1963
        Count: -