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
               Order Tylenchida G. Thorne, 1949
                 Genus Heterodera Schmidt, 1871
                   Heterodera avenae Wollenweber, 1924
                   Heterodera schachtii Schmidt, 1871