Arenysaurus

Arenysaurus is a genus of hadrosauriddinosaur from the Late Cretaceous (66 million years ago), being one of the last non-avian dinosaurs and it went extinct during the Cretaceous–Paleogene extinction event. It is known from a partial skull and skeleton found in the late Maastrichtian-age Tremp Formation of the Pyrenees Mountains in Spain. The type species is A. ardevoli, described in 2009 by Pereda-Suberbiola et al., a group of researchers from Spain. The genus name refers to Arén, where it was found, and the specific epithet honours geologist . Arenysaurus was a lambeosaurine, a member of the hadrosaurid subfamily with hollow and decorative cranial crests. It is one of the most complete and best dated ever found in the Late Cretaceous period.