Theropod and Sauropod Dinosaurs from the Campanian–Maastrichtian Bagua Basin of Perú, Including the First Possible Report of Spinosauridae in Western South America

We provide the first detailed description of osteo-dental non-avian dinosaur fossils from the Fundo El Triunfo Formation in the Bagua Basin (CampanianMaastrichtian) in northwestern Per. The material described in this work includes three isolated teeth, which we refer to Spinosauridae based on the presence of diagnostic dental features, as well as abundant though fragmentary postcranial material that we refer to Titanosauria. A multivariate analysis was performed and provide additional support for referral of the teeth to Spinosauridae. These teeth possibly expand the geographical distribution and temporal range of Spinosauridae, representing their first record in western South America and the youngest remains of the group. The new material also provides key information on the size and distribution of titanosaurs in northern South America during the latest Cretaceous. These findings increase the very scarce record of non-avian dinosaur skeletal material in Per, emphasizing the country's potential for future paleontological exploration. Presentamos la primera descripcin detallada de material osteodental de dinosaurios no avianos de la Formacin Fundo El Triunfo en la Cuenca Bagua (CampanianoMaastrichtiano) en el noroeste de Per. El material descrito en este trabajo incluye tres dientes aislados que a los que referimos a Spinosauridae, en base a la presencia de caractersticas dentales diagnsticas. As tambin, reportamos y describimos abundante material esqueltico fragmentario poscraneal que identificamos como pertenecientes a Titanosauria. Se realiz un anlisis multivariado que proporcion apoyo adicional a la asignacin de los dientes a Spinosauridae. Los dientes encontrados posiblemente expanden la distribucin geogrfica y el rango temporal de Spinosauridae y representaran el primer registro de Spinosauridae en el oeste de Amrica del Sur; y los restos ms recientes para el grupo. As tambin, el material esqueltico de titanosaurios proporciona informacin importante sobre el tamao y distribucin de los titanosaurios en el norte de Sudamrica durante el Cretcico Tardo. Estos hallazgos contribuyen a aumentar el escaso registro de material esqueltico de dinosaurios no aviares en Per., enfatizando el potencial de este pas para exploraciones paleontolgicas a futuro.