Infraphylum Tetrapoda Goodrich, 1930 see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
   Superclass Amniota Haeckel, 1866 see Clade Amniota Haeckel 1866 [Laurin & Reisz 2020]
     Paraclass Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
       Parasubclass Diapsida Osborn, 1903 [paraphyletic] - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
         Parainfraclass Archosauria Cope, 1869 [paraphyletic] see Clade Archosauria Cope 1869 [Gauthier & Padian 2020]
           Superorder †Ornithischia Seeley, 1887 see Order Ornithischia Seeley, 1887
             Order †Ornithopoda Marsh, 1881 see Infraorder Ornithopoda Marsh, 1881
               Family †Hadrosauridae Cope, 1869 - hadrosaurs
                 01 Genus †Amtosaurus Kurzanov & Tumanova, 1978
                 02 Genus †Anatotitan Brett-Surman, 1990 see Genus Edmontosaurus Lambe, 1917
                 03 Genus †Aralosaurus Rozhdestvensky, 1968
                 04 Genus †Brachylophosaurus Sternberg, 1953
                 05 Genus †Cionodon Cope, 1875, nom. dub.
                 06 Genus †Claosaurus Marsh, 1890
                 07 Genus †Diclonius Cope, 1876, nom. dub.
                 08 Paragenus †Edmontosaurus Lambe, 1917 [paraphyletic]
                 09 Genus †Gilmoreosaurus Brett-Surman, 1979
                 10 Genus †Gryposaurus Lambe, 1914
                 11 Genus †Hadrosaurus Leidy, 1858
                 12 Genus †"Hironosaurus" Hisa, 1988, nom. ined.
                 13 Genus †Hypsibema Cope, 1870, nom. dub.
                 14 Genus †Kritosaurus Brown, 1910
                 15 Genus †Lophorhothon Langston, 1960
                 16 Genus †Maiasaura Horner & Makela, 1979
                 17 Genus †Mandschurosaurus Riabinin, 1930, nom. dub.
                 18 Genus †Microhadrosaurus Dong, 1979, nom. dub.
                 19 Genus †Orthomerus Seeley, 1883, nom. dub.
                 20 Paragenus †Prosaurolophus Brown, 1916 [paraphyletic]
                 21 Genus †Saurolophus Brown, 1912
                 22 Genus †Secernosaurus Brett-Surman, 1979
                 23 Genus †Shantungosaurus Hu, 1973
                 24 Genus †Tanius Wiman, 1929
                 25 Genus †Telmatosaurus Nopcsa, 1903
                 26 Genus †Thespesius Leidy, 1856, nom. dub.