Figure 10. Morphological model of Pachyrhachis problematicus in (10.1) lateral view, (10.2) dorsal view, (10.3) ventral view, and (10.4) oblique view. This varies from Caldwell and Lee (1997) in the reconstruction and orientation of the quadrate, the ectopterygoid, and the circumorbital series. The nasals are conjectural as they are not preserved in the specimen. Discussion of the reconstruction of the quadrate and circumorbital bones is detailed in the text. Caldwell and Lee’s (1997) reconstruction of the ectopterygoid is implausible as it would interfere with the natural position of the coronoid and not allow the jaws to be shut. Therefore, we reconstructed the ectopterygoids in a more medial position near the maxilla, allowing passage of the coronoid.