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 Eoacanthocephala Van Cleave, 1936
             Order Gyracanthocephala Van Cleave, 1936
               Family Quadrigyridae Van Cleave, 1920
                 Subfamily Quadrigyrinae Van Cleave, 1920
                   1 Genus Quadrigyrus Van Cleave, 1920
                   2 Genus Acanthodelta Diaz-Ungria & Gracia-Rodrigo, 1958