Bicharracosaurus

What it was like

Bicharracosaurus was a plant-eating sauropod belonging to Macronaria, the group of long-necked dinosaurs that includes some of the largest land animals ever known. So far it is known from only two fossil finds, so its full body size and proportions are still poorly understood. Its closest relatives, including Aragosaurus, Galveosaurus, and Atlasaurus, suggest it had the typical macronarian build: a long neck, a relatively short tail, and thick, column-like legs to support its weight.

Its world

Bicharracosaurus lived in what is now Argentina during the Late Jurassic, between about 162 and 149 million years ago. Its remains come from the Cañadón Calcáreo Formation, where it shared the landscape with other sauropods such as Brachytrachelopan and Tehuelchesaurus, as well as the predator Pandoravenator.

How it was found

Reutter and colleagues named Bicharracosaurus in 2026, making it one of the more recently described sauropods from South America. The genus contains a single species, Bicharracosaurus dionidei. With only two fossil finds recovered so far, much about its size, appearance, and exact place among the macronarian sauropods remains unknown.