Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Dorylaimea Hodda, 2007
       Subclass Dorylaimia Inglis, 1983 [monotypic]
         Superorder Dorylaimica Hodda, 2007 [monotypic]
           Order Dorylaimida Pearse, 1942
             Suborder Dorylaimina Chitwood, 1933
               Superfamily Longidoroidea Thorne, 1935
                 1 Family Longidoridae Thorne, 1935
                 2 Family Xiphinematidae Dalmasso, 1969