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 Seuratoidea Hall, 1916
                 1 Family Chitwoodchabaudiidae Puylaert, 1970
                 2 Family Cucullanidae Cobbold, 1864
                 3 Family Quimperiidae Gendre, 1928
                 4 Family Schneidernematidae Freitas, 1956
                 5 Family Seuratidae Hall, 1916