Fig. 4

3D renderings of the cranium of the holotype of Saxochelys gilberti (DMNH EPV.96000). A anterolateral view into the partial right cranium. B close-up of trigeminal region. C right posterolateral view into the cranium. D close-up of fenestra postotica and internal features of cavum acustico-jugulare. Note that bones are labelled in bold font, and traits are labelled in regular font. acst, aditus canalis stapedio temporalis; ap, antrum postoticum; boc, basioccipital; bpp, broken part of parietal; ccav, canalis cavernosus (posterior opening); epi, epipterygoid; ex, exoccipital; fcep, fossa cartilaginis epipterygoidei; fja, foramen jugulare anterius; fnt, foramen nervi trigemini; fov, fenestra ovalis; fpl, fenestra perilymphatica; fpo, fenestra postotica; IX, external foramen for the glossopharyngeal (CN IX) nerve; op, opisthotic; pa, parietal; pif, processus interfenestralis; ppe, processus pterygoideus externus (transverse process of pterygoid); ppr, posterior prootic recess; pro, prootic; pt, pterygoid; pto, processus trochlearis oticum; q, quadrate; qepp, quadrate epipterygoid process; soc, supraoccipital; sq, squamosal; sta, stapedial artery; v, vomer; VII_hyo, groove for the hyomandibular ramus of the facial (CN VII) nerve; VIII, foramina for the acoustic (CN VIII) nerve