Demandasaurus

Demandasaurus (meaning "Demanda lizard") is a genus of rebbachisaurid sauropod dinosaur from early Cretaceous (late Barremian — early Aptian stage) deposits of Spain. Demandasaurus is known from an incomplete but associated skeleton that includes cranial and postcranial remains. It was collected from the Castrillo de la Reina Formation in Burgos Province. It was first named by Fidel Torcida Fernández-Baldor, José Ignacio Canudo, Pedro Huerta, Diego Montero, Xabier Pereda Suberbiola, and Leonardo Salgado in 2011, and the type species is Demandasaurus darwini.

== Description == thumb|left|Life restoration It has a series of singular characteristics that allow this differentiation as a new genus and species. For example, teeth with a special ornamentation of ridges in its enamel, cervical vertebrae with bone structures that are not present in other dinosaurs, neural arches of the dorsal vertebrae crossed entirely by two pneumatic fossae. The rounded shape of its snout also contrasts with the most square contour snouts of the rest of the diplodocoids and especially its close relative Nigersaurus.