| Diet | Herbivore |
| Height | 4m |
| Length | 16m |
| Weight | 12 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Sauropod |
| Location | Argentina |
Rinconsaurus was a massive sauropod dinosaur that lived in what is now Argentina during the Late Cretaceous period, approximately 85.7 million years ago. This impressive titanosaur was named after the Rincón de los Sauces area where its fossils were discovered, and represents one of the better-known South American sauropods from this time period.
As a titanosaur, Rinconsaurus possessed the classic sauropod body plan: a long neck for reaching high vegetation, a massive barrel-shaped body, four pillar-like legs, and an extremely long tail that served as a counterbalance. Measuring around 16 metres in length and standing about 4 metres tall at the hip, this herbivorous giant would have been an imposing sight in the Cretaceous forests of Patagonia.
Like other sauropods, Rinconsaurus was a plant-eater that used its long neck to browse on conifers, ferns, and other vegetation. Its teeth were adapted for stripping leaves rather than chewing, so it would have swallowed stones to help grind up plant matter in its massive stomach. The discovery of three partial skeletons has provided palaeontologists with valuable insights into the anatomy and lifestyle of these remarkable dinosaurs.
Rinconsaurus lived during a time when South America was home to numerous giant sauropods, making it part of one of the most spectacular dinosaur communities ever discovered. The relatively complete fossil remains have helped scientists better understand how these enormous creatures moved and fed in their ancient environment.
Rinconsaurus possessed the typical titanosaur features including a relatively short neck compared to other sauropods, a broad skull, and likely had small bony plates or osteoderms embedded in its skin. Its vertebrae show distinctive characteristics that help distinguish it from other titanosaurs of the same region.
Rinconsaurus likely lived in herds, as suggested by the discovery of multiple individuals in the same geological formation. These massive sauropods would have spent most of their time feeding, using their long necks to reach vegetation at various heights whilst moving slowly through the Cretaceous landscape of Argentina.
Rinconsaurus was first described by Jorge O. Calvo and Bernardo González Riga in 2003. The original fossils were discovered at Río Neuquén Subgroup, Neuquén Province, Argentina.
