Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Rhabditica Hodda, 2007
           1 Order Diplogasterida Inglis, 1983 see Order Diplogastrida Inglis, 1983
           2 Order Drilonematida Hodda, 2011 [monotypic]
           3 Order Panagrolaimida Hodda, 2007
           4 Order Rhabditida Chitwood, 1933
           5 Order Spirurida Railliet, 1914