Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Enoplea Inglis, 1983
       Subclass Enoplia Pearse, 1942
         Superorder Enoplica Hodda, 2007
           1 Order Enoplida Filipjev, 1929 [monotypic]
           2 Order Ironida Hodda, 2007
           3 Order Tripyloidida Hodda, 2007
           4 Order Alaimida Siddiqi, 1983 [monotypic]
           5 Order Trefusiida Lorenzen, 1981