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. 2009 Jun 17;277(1679):199–209. doi: 10.1098/rspb.2009.0691

Figure 5.

Figure 5.

Schematized view of the jaws and jaw movement in lateral view and the wear facets in anterior view during occlusion in Psittacosaurus. (a) Jaw configuration in P. mongoliensis (AMNH 6534) with mesowear striation angle based on a second specimen (PI 698/1-3; Sereno 2009). (b) Jaw configuration and mesowear striation angle in P. gobiensis (LH PV2). (c) Computed tomographic cross-section of the snout of the skull of P. gobiensis (LH PV2) in anterior view with enlargement of worn maxillary and dentary crowns from the centre of the left upper and lower tooth rows showing the angle of oblique wear. Scale bar in (c), 2 mm. Abbreviations: ar, articular; q, quadrate.