Neornithischia

Neornithischia (`new ornithischians`) is a clade of the dinosaur order Ornithischia. They are the sister group of the Thyreophora within the clade Genasauria. Neornithischians 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 allowe.....
Found on http://en.wikipedia.org/wiki/Neornithischia
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