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 Enoplida Filipjev, 1929
                 Suborder Oncholaimina De Coninck, 1965
                   Superfamily Oncholaimoidea Filipjev, 1916
                     Family Symplocostomatidae
                       1 Genus Enchelium see Genus Enchelidium Ehrenberg, 1836
                       2 Genus Symplocostoma Bastian, 1865