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 Ascaridoidea Baird, 1853
                 1 Family Anisakidae Railliet & Henry, 1912
                 2 Family Ascaridae Baird, 1853
                 3 Family Crossophoridae Baylis, 1920
                 4 Family Heterocheilidae Railliet & Henry, 1912
                 5 Family Raphidascarididae Hartwich, 1954