New Species of Dinosaur Discovered Within Crocodile Jaw

During the Cretaceous period, South America was a site of significant dinosaur discoveries.

Named the dinosaur species Joaquinraptor Casali, this megaraptor was uncovered in 2019 along the banks of the Liochico River in Patagonia, Argentina. It is believed to have existed just before the mass extinction of non-avian dinosaurs 66 million years ago.

Recently, Lucio Ibiricu from the National Council on Science and Technology Research in Tubat, Argentina, and his team conducted an in-depth analysis of the fossil, revealing unexpected findings in the nearly complete skull.

“A relative humerus, likely belonging to an extinct crocodile, was found between the jaws of Joaquinraptor and was in direct contact with its teeth,” states Ibiricu. “This indicates a unique ecological interaction at the time of death.”

Further investigations of the crocodilian humerus are ongoing to ascertain its size, but initial assessments suggest it is considerable, according to Ibiricu.

In addition to the recovered skull, the excavation yielded vertebrae, feet, two claws, arms, legs, and hands. Notably, the thumb claw—approximately the size of a human forearm—could have been effective for tearing the flesh of its prey, according to Ibiricu.

Fossils of other megaraptors have been discovered across Asia, Australia, and South America. Joaquinraptor was first identified close to the Cretaceous period’s end, and it is among the more complete specimens found.

The scientific team concluded that the dinosaur was at least 19 years old at the time of its demise, based on the microstructure of the tibia. It measured approximately 7 meters in length and weighed a minimum of 1 tonne.

Meanwhile, Tyrannosaurus Rex was considerably larger and boasted a massive head, as noted by Ibiricu. Nonetheless, he emphasizes that both species represented apex predators within their respective environments.

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