Boyer diss 2009 1046..

preserved (Fig. 2.15: 55). In fact, the right pterygoid process is continuous with the
basisphenoid (Fig. 2.15: 56) and alisphenoid (Fig. 2.15: 57) contributions to the process
(see below). On the palate, the right palatine terminates at the choanae in a swollen rim
of bone, also referred to as a postpalatine torus (Fig. 2.15: 58). The outer (anterior)
margin of the torus reaches the lateral margin of the pterygoid processes. Furthermore,
the outer margin of the torus is angular, with the anterior part of it following a straight,
transversely-to-slightly-posteriorly-running course (so that the right and left margins
together form a “v” with its tip pointing posteriorly), and the lateral part following a
straight, anteroposteriorly-running course (thus, together the lateral and anterior margins
of the postpalatine torus would form an “m”). The inner margin of the torus, which
forms the inferoposterior margin of the choanae, is biconcave, with a midline postpalatine
spine present (Fig. 2.15: 59), prior to shifting of the contralateral palatines. The level of
the posterior termination to the palatal part of the palatine bone is ambiguous because the
palatines have been thrust anteriorly and to the left.
Sphenoids.— The alisphenoid is visible as the right ectopterygoid process, while
the basisphenoid is visible by its contribution to the right entopterygoid process (Fig.
2.15: 56, 57).
Squamosal.— The right and left squamosals are preserved (Fig. 2.15). The right
side is relatively complete and includes the glenoid (Fig. 2.15: 60), postglenoid process
(Fig. 2.15: 61) and a fragment of zygomatic process (Fig. 2.15: 62). The glenoid is flat
with the condyle of the dentary still sitting in it. It measures 6.5 mm in anteroposterior
length and 5.6 mm in mediolateral width. The postglenoid process is oriented transversly
55