Had our paper been about the species of, say, the also gigantic Argentinian theropod Giganotosaurus there very likely would not have been so much fuss and bother," Paul added. rex that causes people to become agitated to a degree not seen with other paleotaxa (ancient organisms). rex, rather than seriously explore the possibilities that fossil specimens of the genus Tyrannosaurus contained the more than one species that the genus certainly did," Paul said. "It comes across as paleopropaganda that appears to be structured to defend T. Paul criticized the new work as hastily done and "not a proper scientific study." imperator, meaning "tyrant lizard emperor," and T. rex, meaning "tyrant lizard king," Baltimore-based independent paleontologist and paleoartist Gregory Paul and two colleagues proposed two additional species: T. It is the only species of giant apex predator dinosaur that lived at the end of the Cretaceous in North America," Brusatte added.
"Tyrannosaurus rex remains the one true king of the dinosaurs. Tyrannosaurus roamed western North America during the Cretaceous Period at the twilight of the dinosaur age before an asteroid struck Mexico's Yucatan Peninsula 66 million years ago, dooming the dinosaurs. rex into multiple species," Brusatte said. rex are so minor that they do not support the division of T. So the differences between the bones and teeth of T. Just look at the range of height and waistlines and toothy grins in people today, all of whom are members of a single species. "It is normal for any species to be variable in size and shape. The new study looked at intra-species variation in thighbone thickness in four other meat-eating dinosaurs and 112 species of living birds, descendants of small feathered theropods, finding that Tyrannosaurus variations were unexceptional. Tyrannosaurus, part of a group called theropods that included all the carnivorous dinosaurs, had a massive head and tremendous bite strength, walked on two strong legs, and had puny arms with just two fingers. rex bones, but in our new study we show that this variation is minimal," said University of Edinburgh paleontologist Steve Brusatte, a co-author of the new study published in the journal Evolutionary Biology. It is true that there is variation in the size and shape of T. rex, which has been known for over a hundred years, into different species requires a high burden of proof. "The evidence needs to be convincing, and to suddenly divide such an iconic animal like T. Three other researchers said in the earlier study published in the same journal that three species should be recognized based on variation in the thickness of thighbones and in the shape of the lower front teeth among about three dozen Tyrannosaurus specimens.
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