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 Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
             Class Reptilia Linnaeus, 1758 - reptiles
               Subclass Archosauria Cope, 1869 see Division Archosauria Cope, 1869
                 Order †Ornithischia Seeley, 1887
                   Suborder †Ornithopoda Marsh, 1871 see Infraorder Ornithopoda Marsh, 1881
                     01 Family †Heterodontosauridae Romer, 1966
                     02 Family †Hypsilophodontidae Dollo, 1882
                     03 Family †Camptosauridae Marsh, 1885
                     04 Family †Iguanodontidae Cope, 1869
                     05 Family †Hadrosauridae Cope, 1869 - hadrosaurs
                     06 Family †Psittacosauridae Osborn, 1923
                     07 Family †Pachycephalosauridae Sternberg, 1945
                     08 Family †Rotodactylidae Peabody, 1948
                     09 Family †Anomoepodidae Lull, 1904
                     10 Family †Tetrapodosauridae Sternberg, 1932