Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Rhabditica Hodda, 2007
           Order Spirurida Railliet, 1914
             Suborder Ascaridina Inglis, 1983
               Superfamily Heterakoidea Railliet & Henry, 1912
                 1 Family Ascaridiidae Travassos, 1920
                 2 Family Aspidoderidae Skrjabin & Schikhobalova, 1947
                 3 Family Heterakidae Railliet & Henry, 1912