Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Asc-helminthes
           Class Nematoda Gegenbaur, 1859
             Subclass Secernentea
               1 Order Rhabditida Chitwood, 1933
               2 Order Tylenchida G. Thorne, 1949
               3 Order Strongylida see Order Rhabditida Chitwood, 1933
               4 Order Ascaridida see Order Spirurida Railliet, 1914
               5 Order Spirurida Railliet, 1914