Tehuelchesaurus Facts
| Diet | Herbivore |
| Height | 4m |
| Length | 15m |
| Weight | 12 tonnes |
| Environment | Land |
| Era | Jurassic |
| Period | Late Jurassic |
| Type | Sauropod |
| Location | Argentina |

| Diet | Herbivore |
| Height | 4m |
| Length | 15m |
| Weight | 12 tonnes |
| Environment | Land |
| Era | Jurassic |
| Period | Late Jurassic |
| Type | Sauropod |
| Location | Argentina |
Tehuelchesaurus was a magnificent sauropod dinosaur that roamed the landscapes of what is now Argentina during the Late Jurassic period, approximately 158 million years ago. This impressive herbivore was named in honour of the Tehuelche people, the indigenous inhabitants of the Chubut Province where its fossils were discovered. As a member of the macronarian group of sauropods, Tehuelchesaurus possessed the characteristic features that made these dinosaurs so distinctive: a tremendously long neck, massive body, and lengthy tail.
Measuring roughly 15 metres from nose to tail and standing about 4 metres tall at the hip, Tehuelchesaurus weighed approximately 12 tonnes. Its long neck allowed it to reach vegetation that other herbivores couldn't access, giving it a significant advantage in the competitive world of Late Jurassic plant-eaters. Like other sauropods, it would have used its peg-like teeth to strip leaves and soft plant material, swallowing them whole to be processed in its enormous digestive system.
The discovery of Tehuelchesaurus has provided valuable insights into sauropod diversity in South America during the Late Jurassic. Its fossils were found in the Cañadón Calcáreo Formation, an area that has yielded numerous important dinosaur discoveries. The relatively complete nature of some Tehuelchesaurus remains has helped palaeontologists better understand the anatomy and evolutionary relationships of macronarian sauropods.
Living in a warm, humid environment with abundant plant life, Tehuelchesaurus shared its habitat with various other dinosaurs, including carnivorous theropods and other herbivorous species. Its massive size would have provided excellent protection against most predators, though juveniles would have been more vulnerable to attack.
Tehuelchesaurus possessed the typical sauropod features of an extremely long neck, robust body, and lengthy tail, with a relatively small head compared to its massive frame. As a macronarian sauropod, it had enlarged nasal openings and a distinctive skull structure that set it apart from other sauropod groups.
Tehuelchesaurus likely lived in herds for protection and would have spent most of its time feeding on vegetation using its long neck to reach high into trees. Like other sauropods, it probably swallowed stones to help grind plant material in its stomach, and may have migrated seasonally in search of fresh feeding grounds.
Tehuelchesaurus was first described by Rich et al. in 1999. The original fossils were discovered at Cañadón Calcáreo Formation, Chubut Province, Argentina.