Monday , August 15 2022

The ancient T. rex antiquity shows how fast tyrannosaurs became geers


A new dinosaur shows that even Tyrannosaurus rex started initially.

Double I am intrepid, or "the harbinger of doom," the new species is one of the smallest tyrannosaurs that was discovered again of the Cretaceous Period. Analyzes of the animal's fossil leg show that the creature would have stood only 1.2 meters in the hip, and weighed an estimated 78 kilogram – about how much sea deer researchers reported on February 21st Communication Biology.

It's about 96 million years ago, the fossil is the oldest tyrannosaur in North America. Its discovery helps to fill a gap of 70 million years in the development of tyrannosaurs that leads to the ferocious giants such as T. rex.

Teenage of early pedestrian tyrannosaurs in rocks in North America dating to the Late Jurassic Period was found about 150 million years ago, when dinosaur dinosaurs began more of a seater on the food chain. But next time tyrannosaurs are seen in the North American fossil record in 70 million years later, when they have become colossus predators. When and how, the dinosaur who has size within that time is a mystery.

Paleontologist Lindsay Zanno of the University of Carolina State University in Raleigh who remembered his colleagues for 10 years around Emery County in Utah, looking for clues to solve the mystery. That's where the team found M. intrepidus & # 39; Long, thin legs, typical of a fast runner, quite different from later titanic tyrannosaurs.

"What Moors shows that the ancient stock of the big tyrannosaurs is small and fast, "said Thomas Carr, a ferturizer paleontology at Carthage College in Kenosha, Wis., who was not part of the study. And he" s suggested The tyrannosaurs become huge in time stretching between 16 million years between Moors and the soonest the big men. "

Comparison M. intrepidus & # 39; Fossil features with other thyrannosaurs to see where it fits into the tyrannosaur family tree, researchers decided M. intrepidus comes from Asia. It was part of a great migration that included mammals, newts and dinosaurs moving between modern Siberia and Alaska during occasional drops in sea levels, and the authors suggest.

Ultimately, the Cretaceous Period warming climate is likely to be killed by the lovers, says Zanno, but not tyrannosaurs. "They are growing rapidly and going very quickly to become predators of Late Cretaceous ecosystems," he said.

Even with discovery M. intrepidus, the picture of the evolution of a tyrannosaur remains incomplete. "That's great [the new fossil] helps fill in a part of the story, "said a paleontology specialist, a tyrannosaur and Thomas Holtz Jr. at the University of Maryland at Coleg y Parc, but scientists need to find the rest of the skeleton M. intrepidus as well as other tyrannosaurs in the narrow 16 million years between M. intrepidus and her great descendants to help identify when the creatures grew bigger. "The story of tyrannosaurs is not quite sure," he said.

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