Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Rhabditica Hodda, 2007
           Order Drilonematida Hodda, 2011 [monotypic]
             Suborder Drilonematina Hodda, 2011 [monotypic]
               Superfamily Drilonematoidea Pierantoni, 1916
                 1 Family Creagrocercidae Baylis, 1943
                 2 Family Drilonematidae Pierantoni, 1916
                 3 Family Homungellidae Timm, 1966
                 4 Family Mesidionematidae Poinar, 1978
                 5 Family Pharyngonematidae Chitwood, 1950
                 6 Family Scolecophilidae Baylis, 1943
                 7 Family Ungellidae Chitwood, 1950