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90-Million-Year-Old Patagonian Fossil Reveals Missing Chapter in Evolution of Alvarezsauroid Dinosaurs

A remarkably complete skeleton of the alvarezsauroid dinosaur species Alnashetri cerropoliciensis from Patagonia, Argentina, as well as two alvarezsauroid specimens from the northern hemisphere reveal how the once-mysterious lineage of theropod dinosaurs evolved and spread before continents drifted apart.

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