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 Nemata Cobb, 1919 see Phylum Nematoda Gegenbaur, 1859
           Class Adenophorea
             Subclass Enoplia Pearse, 1942
               Order Trichocephalida Spasski, 1954
                 Suborder Trichocephalatina
                   Superfamily Trichosyringoidea see Superfamily Trichinelloidea Ward, 1907
                     Family Cystoopsidae Skrjabin, 1923
                       Genus Cystoopsis Wagner, 1868