living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Annelida Lamarck, 1809 - segmented worms
           Class Polychaeta Grube, 1850 - polychaetes
             01 Order Phyllodocida Dales, 1962
             02 Order Amphinomida Lamarck, 1818
             03 Order Spintherida
             04 Order Eunicida Ushakov, 1955
             05 Order Orbiniida see Order Scolecida Rouse & Fauchald, 1997
             06 Order Spionida Rouse & Fauchald, 1997
             07 Order Chaetopterida see Order Spionida Rouse & Fauchald, 1997
             08 Order Magelonida see Order Spionida Rouse & Fauchald, 1997
             09 Order Psammodrilida
             10 Order Cirratulida
             11 Order Ctenodrilida see Order Terebellida Rouse & Fauchald, 1977
             12 Order Cossurida see Order Scolecida Rouse & Fauchald, 1997
             13 Order Flabelligerida see Order Terebellida Rouse & Fauchald, 1977
             14 Order Opheliida see Order Scolecida Rouse & Fauchald, 1997
             15 Order Sternaspida see Order Terebellida Rouse & Fauchald, 1977
             16 Order Capitellida Fauchald, 1977 see Order Scolecida Rouse & Fauchald, 1997
             17 Order Oweniida see Order Sabellida Fauchald, 1977
             18 Order Terebellida Rouse & Fauchald, 1977
             19 Order Sabellida Fauchald, 1977
             20 Order Nerillida
             21 Order Dinophilida
             22 Order Polygordiida
             23 Order Protodrilida
             24 Order Myzostomida see Family Myzostomidae
             25 Order Poeobiida