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Early dinosaur relative walked like a croc
One of the earliest relatives of dinosaurs had some features we associate today with crocodiles and alligators, a study suggests.
Many palaeontologists have wondered what the earliest dinosaur relatives looked like, as the fossil record in this time period is sparse. Some assumed they walked on two legs, looking a bit like miniature dinosaurs. But the newly described creature walked on four legs like a croc, the journal Nature reports.
The 2-3m (7-10ft) carnivorous animal, unearthed in southern Tanzania, lived some 245 million years ago during the Triassic Period. It pre-dated the earliest dinosaurs. Prof Paul Barrett, one of the authors on the new paper, said: “This is a little animal that we call Teleocrater. It’s not very big...it probably would have weighed about the same as the average family dog.”
Teleocrater rhadinus appeared just after a large group of animals known as archosaurs split into one branch that led to dinosaurs, and another branch that led to today’s alligators and crocodiles. Its anatomy combines features present in the last common ancestor of these groups, such as a crocodilian-like ankle joint, with some features considered characteristic of dinosaurs.
The first fossils belonging to Teleocrater were discovered in 1933 in Tanzania. They were studied at London’s Natural History Museum in the 1950s. But these specimens were missing crucial bones, such as the ankle. Therefore, scientists at the time could not tell whether they were more closely related to crocs or to dinosaurs.
The new specimens were uncovered in the East African country in 2015, resolving some of those outstanding questions. They show that it is one of the earliest members of the archosaur family tree and that it walked like a crocodilian.
Teleocrater, along with other dinosaur relatives, lived across a wide range of different regions, from Russia to India to Brazil. The team’s next steps are to return to southern Tanzania to look for more remains and missing pieces of the Teleocrater skeleton.
(Paul Rincon. www.bbc.com, 12.04.2017. Adaptado.)
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