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 Archiacanthocephala (A. Meyer, 1931)
             Order Oligacanthorhynchida Petrochenko, 1956
               Family Oligacanthorhynchidae Southwell & Macfie, 1925
                 1 Genus Oligacanthorhynchus Travassos, 1915
                 2 Genus Nephridiorhynchus Meyer, 1931
                 3 Genus Prosthenorchis Travassos, 1915
                 4 Genus Macracanthorhynchus Travassos, 1917
                 5 Genus Pachysentis Meyer, 1931
                 6 Genus Oncicola Travassos, 1916
                 7 Genus Neoncicola Schmidt, 1972
                 8 Genus Tchadorhynchus Troncy, 1970