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
                 Family Heterorhabditidae Poinar, 1975
                 Family Syrphonematidae Laumond & Lyon, 1971