Figure 17. Dinilysia patagonica. A in The skull of the Upper Cretaceous snake Dinilysia patagonica Smith-Woodward, 1901, and its phylogenetic position revisited

Figure 17. Dinilysia patagonica. A, right quadrate of MACN-RN 1013 in lateral view; B, right quadrate of MACN-RN 1014 in medial view; braincase of MACN-RN 1014 with the right quadrate still in place (prior to the technical re-preparation) in lateroventral (C) and posteroventral views (D), showing the quadrate and pterygoid in articulation with the braincase. Abbreviations: aa, right atlantal arch; bo, basioccipital; cin, crista interfenestralis; cs, distal portion of the stapedial shaft; io, intermediate ossification; ot, otooccipital; p, parietal; pot, prootic; pt, pterygoid; q, quadrate; stc, concave surface that receives the posterior tip of the supratemporal bone; st, supratemporal; stp, suprastapedial process.