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
             Order Capitellida Fauchald, 1977 see Order Scolecida Rouse & Fauchald, 1997
               Family Capitellidae Grube, 1862
                 1 Genus Notomastus Sars, 1851
                 2 Genus Capitella de Blainville, 1828
                 3 Genus Scyphoproctus Gravier, 1904
                 4 Genus Mediomastus Hartman, 1944
                 5 Genus Eisigella Gravier, 1901