![]() ![]() ![]() typus the fossa is developed rostral and caudal to the trigeminal foramen. The main difference in the orbitotemporal region is that in the specimen described herein, and in the other metriorhynchids examined, the trigeminal fossa is developed mainly caudal to the trigeminal foramen, whereas in P. Thus, these features characterize not only basal but derived Thalattosuchia, as suggested by previous authors. casamiquelai, and Dakosaurus andiniensis) a dorsally exposed laterosphenoid, a laterosphenoid-prootic suture forming a blunt crest separating the supratemporal fenestra into two fossae for muscular attachment, and the quadrate incompletely sutured to the braincase. The specimen from northern Chile shares with other metriorhynchids (e.g., Cricosaurus araucanensis, Metriorhynchus westermanni, M. The general pattern of the orbitotemporal region is consistent with that of the basal thalattosuchian Pelagosaurus typus as described recently. The excellent preservation provides clear sutures and a detailed description, and X-ray computed tomographic (CT) scanning provides internal anatomical details. ![]() ![]() The specimen is referred to the metriorhynchid Metriorhynchus cf. A three-dimensionally preserved metriorhynchid braincase from the Oxfordian of northern Chile is described. ![]()
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