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
               01 Family Diplosentidae Tubangui & Masiluñgan, 1937
               02 Family Heteracanthocephalidae Petrochenko, 1956
               03 Family Illiosentidae Golvan, 1960
               04 Family Rhadinorhynchidae Travassos, 1923
               05 Family Arhythmacanthidae Yamaguti, 1935
               05 Family Arythmacanthidae see Family Arhythmacanthidae Yamaguti, 1935
               06 Family Hypoechinorhynchidae Petrochenko, 1956
               07 Family Pomphorhynchidae Yamaguti, 1939
               08 Family Echinorhynchidae Cobbold, 1876
               09 Family Fessisentidae Van Cleave, 1931
               10 Family Cavisomatidae Petrochenko, 1956