Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Teleostomi Bonaparte, 1836
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. - amniotes see Clade Amniota Haeckel 1866 [Laurin & Reisz 2020]
           Class Reptilia Linnaeus, 1758 [paraphyletic] - 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.
                   †Dinosauria Owen 1841 [Padian & May 1993], nom. cl. inval. see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
                     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 †Brachylophosaurus Sternberg, 1953
                           03 Genus †Cheneosaurus Lambe, 1917
                           04 Genus †Claosaurus Marsh, 1890
                           05 Genus †Corythosaurus Brown, 1914
                           06 Genus †Edmontosaurus Lambe, 1917
                           07 Genus †Hadrosaurus Leidy, 1858
                           08 Genus †Lambeosaurus Parks, 1923
                           09 Genus †Lophorhothon Langston, 1960
                           10 Genus †Maiasaura Horner & Makela, 1979
                           11 Genus †Parasaurolophus Parks, 1922
                           12 Genus †Prosaurolophus Brown, 1916
                           13 Genus †Saurolophus Brown, 1912
                           14 Genus †Aralosaurus Rozhdestvensky, 1968
                           15 Genus †Bactrosaurus Gilmore, 1933
                           16 Genus †Barsboldia Maryanska & Osmólska, 1982
                           17 Genus †Gilmoreosaurus Brett-Surman, 1979
                           18 Genus †Jaxartosaurus Riabinin, 1937
                           19 Genus †Mandschurosaurus Riabinin, 1930, nom. dub.
                           20 Genus †Nipponosaurus Nagao, 1936
                           21 Genus †Shantungosaurus Hu, 1973
                           22 Genus †Tanius Wiman, 1929
                           23 Genus †Tsintaosaurus Young, 1958
                           24 ?Genus †Notoceratops Tapia, 1918, nom. dub.
                           25 Genus †Orthomerus Seeley, 1883, nom. dub.
                           26 Genus †Secernosaurus Brett-Surman, 1979