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 Apicomplexa Levine, 1970 see Infraphylum Apicomplexa Levine, 1970
           Class Sporozoa Leuckart, 1879 see Class Sporozoea
             Subclass Gregarinia see Subclass Gregarinasina Dufour, 1828
               Order Eugregarinida Léger, 1899 see Order Eugregarinorida Léger, 1900
                 Suborder Acephalina see Suborder Aseptatorina Chakravarty, 1960
                   Family Monocystidae Bütschli, 1882
                     Subfamily Oligochaetocystinae Meier, 1956
                       1 Genus Oligochaetocystis Meier, 1956
                       2 Genus Echiurocystis Levine, 1977
                       3 Genus Neomonocystis Geus, 1969
                       4 Genus Acarogregarina Levine, 1977