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
             1 Suborder Aphelenchina Geraert, 1966
             2 Suborder Cephalobina Andrassy, 1974 [monotypic]
             3 Suborder Panagrolaimina Hodda, 2007
             4 Suborder Tylenchina Chitwood, 1950