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 Echinorhynchida Southwell & Macfie, 1925
               Family Cavisomatidae Petrochenko, 1956
                 1 Genus Pseudocavisoma Golvan & Houin, 1965
                 2 Genus Paracavisoma Kritscher, 1957
                 3 Genus Megapriapus Golvan, 1957
                 4 Genus Cavisoma Van Cleave, 1931
                 5 Genus Echinorhynchoides Achmerov & Dombrovskaja-Achmerova, 1941
                 6 Genus Neorhadinorhynchus Yamaguti, 1939
                 7 Genus Rhadinorhynchoides Fukui & Morisita, 1937
                 8 Genus Filisoma Van Cleave, 1928
                 9 Genus Paracanthorhynchus Edmonds, 1967