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Boyer diss 2009 1046..

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posterior termination of the palatal part of the palatine bone is at the level of the posterior<br />

margin of M 3 .<br />

Parietal.— Much of what can be said about the parietals has been described in the<br />

context of the frontal. The sutures with the alisphenoid and squamosal are obscured by<br />

breakage. The right and left elements meet along a straight sagittal suture to form a<br />

single sagittal crest (Figs. 3.1, 4, 6-8, 10: 24). They appear to end short of the nuchal<br />

crests (e.g., Fig. 3.8: 25), such that a different bone forms the posterior margin of the<br />

dorsal aspect of the skull (Fig. 3.8: 26). However the identity of the particular bone that<br />

forms this last segment is not obvious (see below). It appears that the parietals were free<br />

of foramina for ramus temporalis branches of the stapedial artery or emissarial venae<br />

commitantes; however, this assessment lacks confidence because the elements have<br />

suffered so much breakage. The length of the sagittal crest is roughly 41 mm (this<br />

measurement includes the fragment shown in Fig. 3.8, which is not attached to the<br />

specimen in other figures).<br />

Squamosal.— The left glenoid fossa and part of the right glenoid fossa are intact<br />

(Figs. 3.4, 5: 27). Fragments of the contribution to the neurocranial portion are<br />

preserved, but their sutural contacts are obscured through crushing. Although looking at<br />

physical specimens hints that meaningful morphology of the alisphenoid or petrosal<br />

contact might be preserved, HRxCT data shows the internal morphology to be shifted,<br />

sheared, and crushed in these regions. The left postglenoid process (Figs. 3.4, 5: 28) is<br />

oriented transversely and is situated lateral to the postglenoid foramen (Fig. 3.5: 29). It<br />

projects straight ventrally by about 3.7 mm and is separated from the glenoid by a<br />

shallow, transversely running trough on the joint surface (Fig. 3.4: 28). The entoglenoid<br />

192

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