New Data on Cranial Anatomy of the Ceratopsian Dinosaur Psittacosaurus major

@inproceedings{You2008NewDO,
  title={New Data on Cranial Anatomy of the Ceratopsian Dinosaur Psittacosaurus major},
  author={Hailu You and Kyo Tanoue and Peter Dodson},
  year={2008}
}
An exceptionally preserved skull and mandible of ceratopsian dinosaur Psittacosaurus major revealed many anatomical details such as the existence of an elliptical median interpremaxillary foramen, a prominent neurovascular canal on the internal wall of the beak, long, slightly divergent basipterygoid processes developed as vertical blades with a deep cleft between them, and horizontally oriented vomer. The new specimen shows two autapomorphies of Psittacosaurus major, the transversely narrow… 
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TLDR
A novel isognathous jaw mechanism that combines aspects of arcilineal (vertical) and propalinal (horizontal) jaw movement is described that was able to maintain oblique shearing occlusion in an akinetic skull designed to resist high bite forces in psittacosaurs.
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A new basal neoceratopsian dinosaur is described, Mosaiceratops azumai gen. et sp.
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