Fig. 5 in A Triassic crown squamate

Fig. 5. Images of the holotype of C. microlanius showing sphenoid and indicating squamate features. (A) View of holotype highlighting the sphenoid with a prominent dorsum sella (showing a deep fossa) and high crista sellaris. (B) Close-up anterior (and slightly dorsal) view of the sphenoid showing posterior opening of the abducens canal and internal opening of the carotid canal. (C to F) CT scan of sphenoid in (C) ventral, (D) right latero-ventral, (E) antero-ventral, and (F) anterior views. (G to I) CT cross sections on right of each image, with thin white line showing position on left-hand side, which is a dorsal view. (G) is about midway antero-posteriorly with the slice cutting across the lateral "wing." (H) and (I) are at the anterior of the sphenoid; (I) is the most anterior. Squamate features in (C) to (I) show position of Vidian and Abducens canal foramina. All scale bars, 2 mm [bar for (C) and (D) between images; (E) and (F) bar under (F) and bottom bar is for (G) to (I)]. Ab, abducens; Bpsr, parasphenoid rostrum; Btc, trabeculae cranii; Ds, dorsum sella; Ep, epipterygoid; Hy, hypophysial; Icf, internal carotid foramen; Se, sellaris; Vi, vidian; W, wing.