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
               Family †Ceratopsidae Marsh, 1888
                 Subfamily †Chasmosaurinae Lambe, 1915
                   01 Genus †Anchiceratops Brown, 1914
                   02 Paragenus †Arrhinoceratops Parks, 1925 [paraphyletic]
                   03 Paragenus †Chasmosaurus Lambe, 1914 [paraphyletic]
                   04 Genus †Ceratops Marsh, 1888, nom. dub.
                   05 Genus †Diceratops Lull, 1905, nom. illeg.
                   06 Genus †Eoceratops Lambe, 1915
                   07 Genus †Pentaceratops Osborn, 1923
                   08 Genus †Torosaurus Marsh, 1891
                   09 Genus †Triceratops Marsh, 1889
                   10 Genus †Ugrosaurus Cobabe & Fastovsky, 1987, nom. dub.