Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Dorylaimea Hodda, 2007
       Subclass Trichocephalia Hodda, 2007 [monotypic]
         Superorder Trichocephalica Hodda, 2007
           Order Trichocephalida Spasski, 1954 [monotypic]
             Suborder Trichinellina Hodda, 2007 [monotypic]
               Superfamily Trichinelloidea Ward, 1907
                 1 Family Anatrichosomatidae Yamaguti, 1961
                 2 Family Capillariidae Railliet, 1915
                 3 Family Cystoopsidae Skrjabin, 1923
                 4 Family Trichinellidae Ward, 1907
                 5 Family Trichosomoididae Hall, 1916
                 6 Family Trichuridae Ransom, 1911