Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Enoplea Inglis, 1983
       Subclass Triplonchia Hodda, 2007 [monotypic]
         Superorder Triplonchica Hodda, 2007
           Order Triplonchida Cobb, 1920 [monotypic]
             Suborder Diphtherophorina Coomans & Loof, 1970
               Superfamily Trichodoroidea Thorne, 1935 [monotypic]
                 1 Family Trichodoridae Thorne, 1935