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Researchers find pint-sized meat-eating dinosaur

(Agencies)
Updated: 2009-03-18 11:03

Similar small dinos have been uncovered in China in the last few years, and studying those helped the researchers identify this North American version.

"It was hard to tell because it was still encased in rock," Longrich said. "It is only because I had been studying the Chinese dinosaurs I could tell what it was."

"Once we got it out of the rock it was a pretty nice specimen," he added.

Like the velociraptor, the tiny raptor had claws. At first the small claws were thought to come from juveniles, Longrich said. "But when we studied the pelvis, we found the hip bones were fused, which would only have happened once the animal was fully grown."

Previously the smallest carnivorous dinosaurs found in North America have been about the size of a wolf.

The creature has been named Hesperonychus elizabethae, after the late Canadian paleontologist Elizabeth "Betsy" Nicholls, who recovered the specimen. Hesperonychus means "western claw," a reference to the enlarged sickle-shaped claw on its second toe.

The find "emphasizes how little we actually know, and it raises the possibility that there are even smaller ones out there waiting to be found," said Longrich.

Matthew Carrano, a paleontologist at the Smithsonian's National Museum of Natural History, agreed.

"I think there's increasing awareness among vertebrate paleontologists that we have overlooked a lot of small species of dinosaurs. They are harder to find, but also the early history of our science had a lot to do with finding the big and impressive specimens," said Carrano, who was not part of Longrich's team.

"I would predict that the diversity of small dinosaurs will continue to go up in the coming years, all over the world," Carrano said.

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