Reuters reports on a discover discovered in southern Argentina that apparently outdid T. rex and carnosaurus in its ferocity. A fossil of the colossal Cretaceous hunter was found with the leg of a prehistoric crocodile locked in its hungry jaws:
The dinosaur, named Joaquinraptor casali, lived roughly 67 million years ago in what is now central Patagonia at the twilight of the age of dinosaurs, measuring approximately 23 feet (7 meters) long and one ton in weight. The scientists found in its jaws the remains of the leg of a large crocodile relative, raising the possibility that the dinosaur died somehow – perhaps by choking – while making a meal of the croc.
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The Joaquinraptor remains were discovered in 2019 at the headwaters of the Rio Chico near the shore of Lago Colhué Huapi in Argentina’s Chubut Province. The researchers named the discovery site and the dinosaur after [lead researcher Lucio] Ibiricu’s son Joaquin.
The fossil preserves much of the dinosaur’s skull, shoulder girdle, forelimb and hind limb, along with some vertebrae, ribs and other bones. The fossil preserved the sickle-shaped claw on the middle finger but not those from the two other fingers.
“It is among the most complete megaraptoran skeletons yet known to science,” said paleontologist and study co-author Matt Lamanna of the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania.
The researchers said an examination of rib and leg bones showed that the Joaquinraptor was probably about 19 years old when it died – likely already sexually mature but perhaps not fully grown.
Its skull was about 24-28 inches (60–70 cm) long, and its jaws were lined with sharp, curved teeth that are small for a meat-eating dinosaur of this size. Nevertheless, Joaquinraptor was an apex predator – the largest-known meat-eater in its warm, humid, coastal ecosystem.
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You can read more of the dinosaur discovery here, in Nature Communications.