Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Rhabditica Hodda, 2007
           Order Rhabditida Chitwood, 1933
             Suborder Rhabditina Chitwood, 1933
               Superfamily Heterorhabditoidea Poinar, 1975
                 1 Family Heterorhabditidae Poinar, 1975
                 2 Family Syrphonematidae Laumond & Lyon, 1971