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Boyer diss 2009 1046..

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Figure 2.29. Pellouin skull Plesiadapis tricuspidens: A, labeled left ventrolateral view. B,<br />

inset of left orbitotemporal region. B’, enlargement of inset B showing sphenorbital<br />

fissure (123). Optic foramen is not visibly preserved. C, inset of right petrosal and bullar<br />

fragments. C’, enlargement of inset C, showing tubal canal (126) opening. Numbers and<br />

abbreviations: 110 – palatine/alisphenoid suture, 121 – tympanic ring with annular<br />

bridge, 123 – sphenorbital fissure, 124 – foramen ovale fragment, 126 – tubal canal of<br />

right bulla, 127 – posterior carotid foramen and carotid canal. As – alisphenoid; Bas –<br />

basisphenoid; cc – cochlear canaliculus; ps – posterior septum; Bul – auditory bulla; Ect<br />

– ectotympanic; egp – entoglenoid process; Eoc – exoccipital; Fr – frontal; g3 - groove<br />

that leads to s2 (for a small vein?); iof – infraorbital foramen; Mx – maxilla; Pal –<br />

palatine; pgf – postglenoid foramen; pgp – postglenoid process; Ptr – petrosal; s1 – first<br />

(anterior) septum; s2 – second septum; sab – strut connecting annular to bullar part of<br />

ectotympanic; Sq – squamosal.<br />

153

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