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Thursday, November 12, 2009 JOHANNESBURG: A new species of dinosaur that roamed the Earth 197 million years ago, likely an ancestor of the enormous brontosaurus, has been discovered in South Africa, scientists said Wednesday.Dubbed Aardonyx Celestae, a combination of Afrikaans and Greek that means "Earth Claw", fossils of the seven-metre (23-feet) long dinosaur were uncovered in the central Free State province by a team of post-graduate students from Johannesburg's Witswatersrand University."We knew that there were likely to be some fossils in these bone beds... but we did not expect to find anything of this magnitude," said Adam Yates, the scientist who supervised the work.The Aardonyx appears to be ancestors of the massive sauropod dinosaurs, the largest backboned animals ever to walk on land, he said.The fossils from a partial skeleton unveiled Wednesday came from a young dinosaur, Yates said."Growth rings in the rib and shoulder blade sections show that...