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 Dioctophymatida Ryzhikov & Sonin, 1981 [monotypic] Suborder Dioctophymatina Chitwood, 1933 [monotypic] 1 Superfamily Dioctophymatoidea Railliet, 1915