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 Platyhelminthes Gegenbaur, 1859 - flatworms
           Class Cestoda - tapeworms see Infraclass Cestoda
             Subclass Eucestoda - eucestodes see [unranked] Eucestoda
               Order Cyclophyllidea Lankester, 1877
                 Family Tetrabothriidae Linton, 1891
                   1 Genus Priapocephalus Nybelin, 1922
                   2 Genus Strobilocephalus Baer, 1932
                   3 Genus Anophryocephalus Baylis, 1922
                   4 Genus Trigonocotyle Baer, 1932
                   5 Genus Chaetophallus Nybelin, 1916
                   6 Genus Neotetrabothrius Nybelin, 1931 see Subgenus Neotetrabothrius Nybelin, 1929
                   7 Genus Tetrabothrius Rudolphi, 1819