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Boyer diss 2009 1046..

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Figure 2.38. USNM 482353 Ignacius clarkforkensis: A, dorsal view of left ear region<br />

(anterior to right, lateral to top). B, inset of medial edge of medial tympanic process. B’,<br />

enlargement of inset B. Note apparent sutural groove in addition to sutural surface for<br />

ectotympanic (as identified by Kay et al., 1992 and Bloch and Silcox, 2001). C, labeled<br />

ventral view of right ear (anterior to top). D, medial view of right ear. D’, annotated<br />

medial view of right ear with dashed line highlighting fairly crisp, although subtle margin<br />

of ridges on medial process that may represent suture. E, anteromedial view of HRxCT<br />

reconstruction of right ear. F, posterior view of HRxCT reconstruction of right ear.<br />

Ventral to top in D-F. E and F illustrate course of boundary between medial tympanic<br />

process ridges and promontorium. Numbers and abbreviations: ac – aperture for cochlear<br />

fenestra, bs – bullar suture; cc – cochlear canaliculus; ccA – aperture for cochlear<br />

canaliculus; ps – posterior septum; ec – epitympanic crest; er – epitympanic recess; icp –<br />

internal carotid plexus; Ptr – petrosal; rtp – rostral tympanic process; s1 – first (anterior)<br />

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

medial to s1; scc – semicircular canal; tt – tegmen tympani.<br />

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