Main » 2008 » July » 7 » New occurrence of the genus Dakosaurus (Reptilia, Thalattosuchia) in the Upper Jurassic of north-eastern Mexico, with comments upon skull ar
New occurrence of the genus Dakosaurus (Reptilia, Thalattosuchia) in the Upper Jurassic of north-eastern Mexico, with comments upon skull ar
Abstract: A portion of a cranium from the Kimmeridgian La Casita Formation at Zaragoza, Nuevo León, north-eastern Mexico, is described and referred to the thalattosuchian genus Dakosaurus. The specimen is too incomplete for further determination or detailed comparison with forms known from Europe and South America. It represents the second occurrence in the Late Jurassic Mexican Gulf of the genus, which had been conspicuously absent from previous studies of the marine reptiles assemblages. The peculiar supratemporal anatomy of Dakosaurus and Geosaurus is examined in terms of muscle attachment and function.
UANL-FCT-R29, cf. Dakosaurus sp., a – specimen in dorsal view; b – interpretative drawing in dorsal view. Hatched areas represent bone in section or sediment. Scale 50 mm. c – Dorsal view of the skull of D. andiniensis redrawn from GASPARINI et al. (2006), with the portion represented by UANL-FCT-R29 shaded grey. Abbreviations: f: frontal; po: postorbital; prf: prefrontal.