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 Chromadoria Adamson, 1987
               Order Monhysterida Filipjev, 1929
                 Suborder Monhysterina De Coninck & Schuurmans Stekhoven, 1933
                   Superfamily Monhysteroidea De Man, 1876
                     1 Family Monhysteridae De Man, 1876
                     2 Family Scaptrellidae
                     3 Family Sphaerolaimidae Filipjev, 1918
                     4 Family Xyalinidae see Family Xyalidae Chitwood, 1951
                     5 Family Meyliidae De Coninck, 1965