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 Dorylaimida Pearse, 1942
                 Suborder Dorylaimina Chitwood, 1933
                   Superfamily Dorylaimoidea De Man, 1876
                     Family Longidoridae Thorne, 1935
                       Genus Xiphinema Cobb, 1913
                         Xiphinema index Thorne & Allen, 1950