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
               Parafamily †Iguanodontidae Cope, 1869 [paraphyletic]
                 1 Genus †Anoplosaurus Seeley, 1879, nom. dub.
                 2 Genus †Craspedodon Dollo, 1883, nom. dub.
                 3 Genus †"Fukuisaurus" Lambert, 1990, nom. ined.
                 4 Genus †Gravisaurus Chabli, 1988, nom. ined. see Genus Lurdusaurus Taquet & Russell, 1999
                 5 Genus †Iguanodon Mantell, 1825
                 6 ?Genus †Loncosaurus Ameghino, 1899, nom. dub.
                 7 Genus †Ouranosaurus Taquet, 1976
                 8 Genus †Probactrosaurus Rozhdestvenskii, 1966
                 9 Genus †Sanpasaurus Young, 1944, nom. dub.