Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates 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 †"Anatotitan" Brett-Surman, 1990 see Genus Edmontosaurus Lambe, 1917
                   02 Genus †Aralosaurus Rozhdestvensky, 1968
                   03 Genus †Arstanosaurus Shilin & Suslov, 1982, nom. dub.
                   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 Genus †Edmontosaurus Lambe, 1917
                   09 Genus †Gilmoreosaurus Brett-Surman, 1979
                   10 Genus †Gryposaurus Lambe, 1914
                   11 Genus †Hadrosaurus Leidy, 1858, nom. dub.
                   12 Genus †"Hironosaurus" Hisa, 1988, nom. nud.
                   13 Genus †Kritosaurus Brown, 1910, nom. dub.
                   14 Genus †Lophorhothon Langston, 1960
                   15 Genus †Maiasaura Horner & Makela, 1979
                   16 Genus †Mandschurosaurus Riabinin, 1930, nom. dub.
                   17 Genus †Microhadrosaurus Dong, 1979, nom. dub.
                   18 Genus †Orthomerus Seeley, 1883, nom. dub.
                   19 Genus †Prosaurolophus Brown, 1916
                   20 Genus †Saurolophus Brown, 1912
                   21 Genus †Secernosaurus Brett-Surman, 1979
                   22 Genus †Shantungosaurus Hu, 1973
                   23 Genus †Tanius Wiman, 1929
                   24 Genus †Telmatosaurus Nopcsa, 1903
                   25 Genus †Thespesius Leidy, 1856, nom. dub.
                   26 Genus †Trachodon Leidy, 1856, nom. dub.
                   27 Genus †Tsintaosaurus Young, 1958