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Boyer diss 2009 1046..

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Figure 2.37. AMNH 185638 Indri indri: A, stereophotographic medial view of left<br />

petrosal with broken bulla and medial tympanic process. B, enlarged medial view.<br />

Anterior to bottom in both parts. Interestingly, broken medial process appears to be<br />

comprised of two bony lamina and looks just like broken medial process of taxa that have<br />

non-petrosal bulla, as well as that of plesiadapids (Figs. 2.35, 36). Euprimates, including<br />

Indri, have petrosal bulla, thus multiple laminae cannot be taken as evidence of multiple<br />

bones in this region. Numbers and abbreviations: icp – internal carotid plexus; Ptr –<br />

petrosal; s1 – first (anterior) septum: most lateral septum extending anteriorly from<br />

promontorium (tubal canal forms between s1 and epitympanic crest); s2 – second septum:<br />

forms medial to s1and projects anteromedially from promontorium (g3 typically leads to<br />

the ventral or medial aspect of this septum); tng? – tympanic nerve groove?<br />

169

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