Meat-eating reptile fossils hint at wide diversity of dinosaur ancestors
First posted: Wednesday, April 12, 2017 01:12 PM EDT | Updated: Wednesday, April 12, 2017 01:16 PM EDT
NEW YORK ó Fossils of a four-legged, meat-eating reptile are helping paint a more complicated picture of the ancestry of dinosaurs than scientists had understood.
The creature was not a direct ancestor, but was more like a cousin. It lived about 245 million years ago, roughly 10 million years before dinosaurs appeared. Itís the oldest known member of an evolutionary branch of animals that eventually led to dinosaurs and pterosaurs, living relatively soon after that branch split away from the ancestry of crocodiles.
Researchers who found fossils in Tanzania in 2015 describe the creature in a paper released Wednesday by the journal Nature . Itís called Teleocrater rhadinus.
It was 7 to 10 feet (2 to 3 metres) long, smaller than crocodiles. While almost all early dinosaurs apparently walked on two legs, Teleocrater shows that a four-legged style was still present at this point, said Sterling Nesbitt of Virginia Tech in Blacksburg, lead author of the paper.
It also had a crocodile-like ankle, rather than the more bird-like ankle later seen in dinosaurs, and a surprisingly long neck, he said. The paperís analysis indicates such dinosaur relatives were more diverse than thought, he said.
Luis Chiappe of the Natural History Museum of Los Angeles County, who didnít participate in the study, called the work important for understanding the origin of dinosaurs. ďIt tells you about a much more complex picture than what was previously imagined,Ē he wrote in an email.
This artist's rendering provided by Gabriel Lio in April 2017 shows the Teleocrater rhadinus, a four-legged, meat-eating reptile and a close relative of dinosaurs. Researchers who found its fossils in Tanzania in 2015 describe it in a paper released Wednesday, April 12, 2017 by the journal Nature. (Gabriel Lio/Museo Argentino de Ciencias Naturales, Buenos Aires via AP)

Meat-eating reptile fossils hint at wide diversity of dinosaur ancestors | World