FIG. 41. Prothylacynus patagonicus YPM VPPU-15700 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals

FIG. 41. Prothylacynus patagonicus YPM VPPU-15700 (Borhyaenoidea, Sparassodonta), adult caudal cranium, selected coronal segments in rostrocaudal order (data source, table 2). Rostral branches of transverse canals (features 1–4, cf. fig. 40A, D) are situated relatively more rostrally than in extant marsupials. However, they connect with transverse basisphenoid sinus and carotid canals via caudal branches as well as interstitial canaliculi, similar to conditions in certain marsupials. In B, asterisk indicates dorsally directed interstitial canaliculus originating from transverse canal. Key: AS, alisphenoid; br, breakage; BS, basisphenoid; cbtc, caudal branch of transverse canal; cc, carotid canal; ctbs, caudal portion of transverse basisphenoid sinus; encf, endocranial carotid foramen;?hpf, hypophyseal fossa; junc1, junc2, junctions of rostral branches of transverse canals; mxnc, canal for maxillary nerve; mxns, sulcus for maxillary nerve; obf, fossa for olfactory lobes; onvs, sulcus for ophthalmic neurovascular array; PT, pterygoid; ptc, pterygoid canal; rtbs, rostral portion of transverse basisphenoid sinus; SQ, squamosal.