Boyer diss 2009 1046..

(Figs. 3.1, 4-6: 13), the zygomatic is 7.9 mm deep. There is no evidence of a postorbital
process in this vicinity. The ventral surface of the anterior end of the zygomatic is
expanded transversely for attachment of the superficial masseter (Fig. 3.5: 14) (as is the
zygomatic process of the maxilla at its suture with the zygomatic). This expansion
measures 2.38 mm. The total anteroposterior length of the element along its ventral
margin is 24.9 mm. The posterior end has a fragment of the zygomatic process of the
squamosal still attached to it. The suture between these two elements measures at least
14.2 mm.
Frontal.— The frontals are visible on the dorsum of the skull; in this region the
frontals clearly contact the maxillae and lacrimals (Fig. 3.1: 4, 6). The contact between
the premaxillae (if any) and nasals are obscured by breakage. Furthermore, breakage
makes the existence and/or nature of contacts with the palatine, orbitosphenoid,
alisphenoid, and parietal difficult to assess. A metopic suture is prominent (Fig. 3.1, 6:
15) and extends from the anterior end of the frontals to the parietals. Noting some
breakage in the region of nasal contact, the anteroposterior length of the frontal is 21 mm
and the unilateral width, from the metopic suture to the lacrimal suture, is roughly 15.3
mm. The frontals exhibit distinct ridges (temporal crests) that run medially from the
anterolateral part of the bones, where they contact the lacrimals, toward the metopic
suture. The temporal crests meet the metopic suture at the posterior end of the frontals,
where they contact the parietals (Fig. 3.1: 16). Thus, they would have formed a distinct
“trigon” on the forehead. There is no sign of postorbital processes on these bones.
HRxCT data reveal the frontal as a thin plate of bone anteriorly and show that the bone
thickens posteriorly and is densely trabeculated. No major diploic cavities are
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