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 Protozoa Goldfuss, 1818 see Kingdom Protozoa Goldfuss, 1818
         Phylum Sarcomastigophora Honigberg & Balamuth, 1963
           Subphylum Mastigophora Diesing, 1866 - flagellates
             Class Zoomastigophora see Class Zoomastigophorea
               Order Diplomonadida Wenyon, 1926 - diplomonads
                 Suborder Diplomonadina see Order Diplomonadida Wenyon, 1926
                   Family Hexamitidae Kent, 1881
                     Subfamily Hexamitinae Kent, 1880 see Family Hexamitidae Kent, 1881
                       Genus Spironucleus Lavier, 1936
                         1 Spironucleus elegans
                         2 Spironucleus meleagridis
                         3 Spironucleus columbae
                         4 Spironucleus muris