Kingdom Animalia Linnaeus, 1758 - animals Phylum Nematoda Gegenbaur, 1859 - round worms Class Dorylaimea Hodda, 2007 Subclass Trichocephalia Hodda, 2007 [monotypic] Superorder Trichocephalica Hodda, 2007 1 Order Dioctophymatida Ryzhikov & Sonin, 1981 [monotypic] 2 Order Marimermithida Rubtzov, 1980 [monotypic] 3 Order Muspiceida Bain & Chabaud, 1959 [monotypic] 4 Order Trichocephalida Spasski, 1954 [monotypic]