Which titanosaurian sauropod is mentioned as existing within the same ancient South American ecosystem as *Xenotarsosaurus*?
Answer
Drusilasaura
The context of the Bajo Barreal Formation ecosystem during the Cenomanian to Turonian stages included several notable dinosaurs alongside the theropod *Xenotarsosaurus*. Specifically mentioned as part of this ancient fauna are the hadrosaurid *Secernosaurus* and the titanosaurian sauropod known as *Drusilasaura*. The presence of *Drusilasaura* helps paint a picture of the faunal community, suggesting that *Xenotarsosaurus* likely functioned as one of the primary local predators operating within that environment.

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