Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
       Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
         Superorder Archosauria Cope, 1869 - archosaurs see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
           Order †Ornithischia Seeley, 1887
             Suborder †Ornithopoda Marsh, 1871 see Infraorder Ornithopoda Marsh, 1881
               Family †Hadrosauridae Cope, 1869 - hadrosaurs
                 01 Genus †Anatosaurus Lull & Wright, 1942 see Genus Edmontosaurus Lambe, 1917
                 02 Genus †Bactrosaurus Gilmore, 1933
                 03 Genus †Corythosaurus Brown, 1914
                 04 Genus †Edmontosaurus Lambe, 1917
                 05 Genus †Hadrosaurus Leidy, 1858
                 06 Genus †Hypacrosaurus Brown, 1913
                 07 Genus †Kritosaurus Brown, 1910
                 08 Genus †Lambeosaurus Parks, 1923
                 09 Genus †Maiasaura Horner & Makela, 1979
                 10 Genus †Parasaurolophus Parks, 1922
                 11 Genus †Prosaurolophus Brown, 1916
                 12 Genus †Saurolophus Brown, 1912
                 13 Genus †Shantungosaurus Hu, 1973
                 14 Genus †Tsintaosaurus Young, 1958