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 †Iguanodontidae Cope, 1869
                   1 Genus †Anoplosaurus Seeley, 1879, nom. dub.
                   2 Genus †Craspedodon Dollo, 1883, nom. dub.
                   3 Genus †Iguanodon Mantell, 1825
                   4 Genus †Ouranosaurus Taquet, 1976
                   5 Genus †Probactrosaurus Rozhdestvenskii, 1966
                   6 Genus †Vectisaurus Hulke, 1879, nom. dub.