TIMELINE

Palaeozaic era

Mesozaic era

Triassic period: 245 million years ago

Jurassic period: (208 million years ago)

Cretaceous period: (144 million years ago)

Cerapoda is a clade or suborder of the order Ornithischia. They are the sister group of the Thyreophora within the clade Genasauria. Cerapods are united by having a thicker layer of asymmetrical enamel on the inside of their lower teeth. The teeth wore unevenly with chewing and developed sharp ridges that allowed cerapods to break down tougher plant food than other dinosaurs.

They are divided either into two or three groups. The first of these groups were Ornithopoda ("bird-foot"). The other two groups were the Pachycephalosauria ("thick-headed lizards") and Ceratopsia ("horned-face"). These latter two are sometimes combined as Marginocephalia ("fringed heads") owing to their shared features which included the bony shelf they possessed on the back of the skull.

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MAJOR GROUPS

• Albalophosaurus
•  ? Agilisaurus
• Stormbergia
• Hexinlusaurus
• Infraorder Ornithopoda

• Family Hypsilophodontidae *
• Family Hadrosauridae - (duck-billed dinosaurs)
• Infraorder Pachycephalosauria
• Infraorder Ceratopsia -