Kingdom Animalia Linnaeus, 1758 - animals Phylum Nematoda Gegenbaur, 1859 - round worms Class Chromadorea Inglis, 1983 Subclass Plectia Hodda, 2007 Superorder Rhabditica Hodda, 2007 Order Panagrolaimida Hodda, 2007 Suborder Panagrolaimina Hodda, 2007 Superfamily Steinernematoidea Chitwood & Chitwood, 1937 [monotypic] Family Steinernematidae Chitwood & Chitwood, 1937