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 Acanthocephala Kohlreuther, 1771 - acanthocephalans see [unranked] Acanthocephala Kohlreuther, 1771
           Class Palaeacanthocephala (Meyer, 1931)
             Order Polymorphida Petrochenko, 1956
               Family Polymorphidae Meyer, 1931
                 Genus Polymorphus Lühe, 1911
                   1 Subgenus Polymorphus Lühe, 1911
                   2 Subgenus Profilicollis Meyer, 1931
                   3 Polymorphus minutus (Goeze, 1782)
                   4 Polymorphus magnus Skrjabin, 1913
                   5 Polymorphus paradoxus Connell & Corner, 1957