Newly Discovered Argentine Dinosaur Sheds Light on Megaraptorans

Paleontologists in Argentina have unearthed a new dinosaur species, Joaquinraptor casali, offering valuable insights into the elusive megaraptoran group. The discovery includes a well-preserved partial skeleton, featuring much of the skull, limbs, ribs, and vertebrae. Notably, a crocodile relative's leg bone was found lodged in its jaws, suggesting potential dietary habits.

Joaquinraptor casali lived approximately 67 million years ago in central Patagonia, measuring about 23 feet in length and weighing around one ton. Unlike the massive Tyrannosaurus rex, this species had a more lightly built skull, smaller teeth, and long, clawed arms—adaptations likely used for hunting.

The fossil was discovered in 2019 near Lago Colhué Huapi in Argentina's Chubut Province. The species was named by paleontologist Lucio Ibiricu in memory of his son, Joaquin.

This find is among the most complete megaraptoran skeletons to date, providing a clearer understanding of their anatomy, evolution, and ecological role. The presence of the crocodile bone in its jaws may offer clues about its diet and position as a top predator in its ecosystem.

The discovery was detailed in the journal Nature Communications.