Figure 92.

Configuration of jaw articulation and long axis of the lower jaw in Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Diagrammatic depiction of jaw configuration based on subadult skull AMNH 24000 and adult skull SAM-PK-K1332 A Left quadrate condyles in anterior view showing 30° angle from the horizontal B Left quadrate condyles and long axis of the lower jaw in ventral view showing 40° angle from a transverse axis and 10° divergence from the midline, respectively.