Kingdom Animalia Linnaeus, 1758 - animals Phylum Nematoda Gegenbaur, 1859 - round worms Class Chromadorea Inglis, 1983 Subclass Plectia Hodda, 2007 Superorder Rhabditica Hodda, 2007 Order Spirurida Railliet, 1914 Suborder Gnathostomatina Skrjabin & Ivaschkin, 1973 [monotypic] 1 Superfamily Gnathostomatoidea Railliet, 1895 [monotypic]