Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Enoplea Inglis, 1983
       Subclass Enoplia Pearse, 1942
         Superorder Enoplica Hodda, 2007
           Order Enoplida Filipjev, 1929 [monotypic]
             Suborder Enoplina Chitwood & Chitwood, 1937
               Superfamily Enoploidea Dujardin, 1845
                 1 Family Enoplidae Dujardin, 1845
                 2 Family Thoracostomopsidae Filipjev, 1927