Amargatitanis

Amargatitanis was first thought to be a titanosaur, but later scientists realized it was a dicraeosaurid, a group of sauropods with short necks and tall spines on their vertebrae.1

The only known skeleton of Amargatitanis is incomplete: just a partial hind leg, a hip bone, and two vertebrae. That makes it hard for scientists to know exactly what it looked like.1

Amargatitanis lived about 129 to 123 million years ago, during the Early Cretaceous period.1

The fossils were collected by famous paleontologist José Bonaparte in 1983, but the dinosaur wasn't named until 2007 by Sebastián Apesteguía.1

Amargatitanis shared its home with other sauropods like Amargasaurus and Zapalasaurus. They probably ate different plants to avoid competing for food.1

Like other dicraeosaurids, Amargatitanis had a long tail and strong legs. Its neck was shorter than many other sauropods, so it probably fed at heights up to about 2.7 metres (8.9 feet).1