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 Tylenchina Chitwood, 1950
               Superfamily Anguinoidea Nicoll, 1935 (1926)
                 1 Family Anguinidae Nicoll, 1935 (1926)
                 2 Family Sychnotylenchidae Paramonov, 1967