Leyesaurus

Leyesaurus is an extinct genus of massospondylid sauropodomorph dinosaur known from the San Juan Province, northwestern Argentina.

== Description == thumb|left|Silhouette reconstruction of the skeleton of L. marayensis thumb|left|Skull of L. marayensis in dorsal view Leyesaurus is known from the holotype PVSJ 706, a nearly complete skull with articulated mandible and some postcranial remains (vertebral column, scapular and pelvic girdles and hindlimb). The skull has a length of 18 centimeters, and Leyesaurus has been estimated to have been about in length. It was collected from the uppermost part of the Quebrada del Barro Formation of the Marayes-El Carrizal Basin, dating to the Lower Jurassic (based on the similarities between Leyesaurus and Lower Jurassic sauropodomorphs, like Massospondylus and Adeopapposaurus). Leyesaurus was found near the locality Balde de Leyes, in the Caucete Department of San Juan Province. Within Massospondylidae, Leyesaurus was found to be most closely related to Adeopapposaurus.