Reptilia Laurenti, 1768
Achelousaurus Sampson, 1995
Agathaumas Cope, 1872
Agujaceratops
Albertaceratops
Anchiceratops Brown, 1914
Arrhinoceratops Parks, 1925
Avaceratops Dodson, 1986
Brachyceratops Gilmore, 1914
Centrosaurus Lambe, 1904
Ceratops Marsh, 1888
Ceratopsipes Lockley & Hunt, 1995
Chasmosaurus Lambe, 1914
Dysganus Cope, 1877
Einiosaurus Sampson, 1995
Eoceratops Lambe, 1915
Eotriceratops
Monoclonius Cope, 1877
Nedoceratops
Pachyrhinosaurus Sternberg, 1950
Pentaceratops Osborn, 1923
Polyonax Cope, 1874
Proceratops Lull, 1906
Styracosaurus Lambe, 1916
Torosaurus Marsh, 1891
Triceratops Marsh, 1889
Turanoceratops Nesov & Kaznyshkina, 1989
Ugrosaurus Cobabe & Fastovsky, 1987
