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 Phyllodocida Dales, 1962
               Superfamily Aphroditacea Malmgren, 1867 see Superfamily Aphroditoidea Malmgren, 1867
                 Family Sigalionidae Kinberg, 1856
                   1 Genus Psammolyce Kinberg, 1855
                   2 Genus Sigalion Audouin & Milne Edwards, in Cuvier, 1830
                   3 Genus Sthenelais Kinberg, 1855
                   4 Genus Neoleanira Pettibone, 1970
                   5 Genus Willeysthenelais Pettibone, 1971
                   6 Genus Sthenelanella Moore, 1910