• Reuters

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On a semiarid Patagonian landscape 85 million years ago, a formidable meat-eater called Tratayenia rosalesi reigned as the apex predator, part of an enigmatic dinosaur group that menaced South America and Australia for tens of millions of years.

Scientists on Wednesday described Tratayenia, a two-legged beast up to about 30 feet (9 meters) long, based on fossils unearthed in Argentina’s Neuquen province, adding another impressive dinosaur to the list of those that inhabited Patagonia during the Cretaceous Period.

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