Science Fair Project Encyclopedia
Ceratopsidae
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|(unranked)||Coronosauria
Centrosaurinae
Achelousaurus
Centrosaurus
Einiosaurus
Styracosaurus
Pachyrhinosaurus
Ceratopsinae
Chasmosaurus
Diceratops
Pentaceratops
Torosaurus
Triceratops
Ceratopsids, or members of the Ceratopsidae family, are a diverse group of marginocephalian dinosaurs like Triceratops and Styracosaurus . They were quadrupedal, herbivores from the Upper Cretaceous of Western North America and are characterized by beaks, shearing teeth in the back of the jaw, and elaborate horns and frills. The group is divided into two subfamilies. The Ceratopsinae or Chasmosaurinae are characterized by long smoother frills and eyebrow horns. The Centrosaurinae had well-developed nasal horns or nasal bosses, shorter frills, and elaborate spines on the frill.
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