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New species discovered in Canada

An artist's conception of Thanatotheristes degrootorum, the first new tyrannosaur species named in Canada in 50 years.
  • “This discovery is significant because it fills in a gap in our understanding of tyrannosaur evolution.”
  • Tyrannosaurs were a group of large meat-eating dinosaurs that includes the famous Tyrannosaurus rex.
  • The first part of the new dinosaur’s name alludes to its role as an apex predator.

The fossil of a new species of tyrannosaur has been discovered in Canada, according to a study released Monday.

The monstrous beast was named the “reaper of death” due to its fearsome predatory behavior.

“This discovery is significant because it fills in a gap in our understanding of tyrannosaur evolution,” study co-author Francois Therrien of the Royal Tyrrell Museum in Drumheller, Alberta, said in a statement. “We are thrilled to announce the first new species of tyrannosaur to be discovered in Canada in 50 years.”

Another co-author, Darla Zelenitsky of the University of Calgary, said in a statement “this is the oldest occurrence of a large tyrannosaur in Canada, found in an older window of time than where previous tyrannosaurs have been found.”

The roughly 79.5 million-year-old fossil makes the new species 2.5 million years older than its closest relative.

The newly identified dinosaur, known by its Latin name Thanatotheristes degrootorum, provides scientists with insights into the tyrannosaur family tree and shows tyrannosaurs from the Cretaceous of Alberta were more diverse than previously known.

Tyrannosaurs were a group of large predatory meat-eating dinosaurs that included the famous Tyrannosaurus rex.

An artist's conception of what the new species of tyrannosaur may have looked like.

Thanatotheristes, which was approximately 30 feet long, likely preyed on large plant-eating dinosaurs, such as the horned Xenoceratops and the dome-headed Colepiochephale.

Scientists were able to identify the new species by analyzing unique features of fossil skull fragments.

“Thanatotheristes can be distinguished from all other tyrannosaurs by numerous characteristics of the skull, but the most prominent are vertical ridges that run the length of the upper jaw,” said lead author Jared Voris, a University of Calgary Ph.D. candidate.

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