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 †Ceratopsia Marsh, 1890 see Infraorder Ceratopsia Marsh, 1890
               Parafamily †Protoceratopsidae Granger & Gregory, 1923 [paraphyletic]
                 1 Genus †Asiaceratops Nesov & Kaznyshkina, 1989
                 2 Genus †Bagaceratops Maryanska & Osmólska, 1975
                 3 Genus †Breviceratops Kurzanov, 1990
                 4 Genus †Leptoceratops Brown, 1914
                 5 Genus †Microceratops Bohlin, 1953, nom. illeg. see Genus Microceratus Mateus, 2008
                 6 Genus †Montanoceratops Sternberg, 1951
                 7 Genus †Notoceratops Tapia, 1918, nom. dub.
                 8 Genus †Protoceratops Granger & Gregory, 1923
                 9 ?Genus †Stenopelix Meyer, 1857