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 †Hypsilophodontidae Dollo, 1882 [paraphyletic]
                 01 Genus †Atlascopcosaurus Rich & Rich, 1989
                 02 ?Genus †Drinker Bakker, Galton, Siegwarth & Filla, 1990 see Genus Nanosaurus Marsh, 1877
                 03 Genus †Fulgurotherium Huene, 1932, nom. dub.
                 04 Genus †Gongbusaurus Dong, Zhou & Zhang, 1983, nom. dub.
                 05 Genus †Hypsilophodon Huxley, 1870
                 06 Genus †Laosaurus Marsh, 1878, nom. dub.
                 07 Genus †Leaellynasaura Rich & Rich, 1989
                 08 ?Genus †Othnielia Galton, 1977, nom. dub.
                 09 Genus †Orodromeus Horner & Weishampel, 1988
                 10 ?Genus †Parksosaurus Sternberg, 1937
                 11 Genus †Phyllodon Thulborn, 1973, nom. dub.
                 12 Genus †Rhabdodon Matheron, 1869, nom. cons.
                 13 ?Genus †Tenontosaurus Ostrom, 1970
                 14 Genus †Thescelosaurus Gilmore, 1913
                 15 Genus †Xiaosaurus Dong & Tang, 1983
                 16 Genus †Yandusaurus He, 1979
                 17 Genus †Zephyrosaurus Sues, 1980