• Ceratopidae
  • Avaceratops lammersi [i. s.]
  • Centrosaurinae
    • Centrosaurini
      • Centrosaurus apertus
      • Styracosaurus albertensis *
      • Styracosaurus ovatus
    • Pachyrhinosaurini
      • Brachyceratops montanensis
      • ---
        • Einiosaurus procurvicornis
        • ---
          • Achelousaurus horneri
          • Pachyrhinosaurus canadensis
  • Ceratopinae
    • Chasmosaurini
      • Chasmosaurus belli *
      • Chasmosaurus canadensis
      • Chasmosaurus mariscalensis
      • Chasmosaurus russelli
      • Chasmosaurus sternbergi
      • Pentaceratops sternbergi
    • ---
      • Anchiceratops ornatus
      • ---
        • Arrhinoceratops brachyops
        • ---
          • Torosaurus latus
          • ---
            • Diceratops hatcheri
            • Triceratops horridus *
            • Triceratops ingens
            • Triceratops prorsus

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Revised: June 1, 1998; New: January 1, 1996