Kingdom Animalia Linnaeus, 1758 - animals Phylum Nematoda Gegenbaur, 1859 - round worms Class Enoplea Inglis, 1983 Subclass Enoplia Pearse, 1942 Superorder Enoplica Hodda, 2007 Order Trefusiida Lorenzen, 1981 1 Suborder Trefusiina Siddiqi, 1983