Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Reptilia Linnaeus, 1758 - reptiles
               Subclass Archosauria Cope, 1869 see Division Archosauria Cope, 1869
                 Order †Ornithischia Seeley, 1887
                   Suborder †Ceratopsia Marsh, 1890 see Infraorder Ceratopsia Marsh, 1890
                     1 Family †Protoceratopsidae Granger & Gregory, 1923
                     2 Family †Ceratopsidae Marsh, 1888
                     3 Family †Pachyrhinosauridae Sternberg, 1950
                     4 Family †Caenagnathidae Sternberg, 1940