Fig. 7. Lipotyphlan mammal Solenodon paradoxus Brandt, 1833 in Petrosal and cranial vascular system of the early Eocene palaeoryctid mammal Eoryctes melanus from northwestern Wyoming, USA

Fig. 7. Lipotyphlan mammal Solenodon paradoxus Brandt, 1833, left basicranium in ventral view. A. CM 18069, photograph of adult (A1); close-up of ear region (A2). B. Drawing of juvenile AMNH 28272 with arterial reconstruction based on MPIH 6863 (modified from Wible 2008: fig. 26C). Caudal tympanic process of the petrosal is broken in CM 18069, exposing the cochlear fossula. Asterisk in A2 is on the membrane of the piriform fenestra in the location of the tensor tympani muscle. Tympanohyal does not contact caudal tympanic process in juvenile AMNH 28272 but does in adults (Wible 2008). Abbreviations: as, alisphenoid; bo, basioccipital; bs, basisphenoid; cf, cochlear fossula; cin, carotid incisure; ctp, caudal tympanic process of petrosal; egp, entoglenoid process; eo, exoccipital; er, epitympanic recess; ew, epitympanic wing of petrosal; fm, foramen magnum; gf, glenoid fossa; ica, internal carotid artery; jf, jugular foramen; me, mastoid exposure; pf, piriform fenestra; pgf, postglenoid foramen; pr, promontorium of petrosal; ri, ramus inferior; rp, ramus posterior; rs, ramus superior; rtp, rostral tympanic process of petrosal; sa, stapedial artery; sm, stapedius muscle; sq, squamosal; th, tympanohyal.