纳米暴龙并非少年霸王龙

↑ A fossil thought to be a teenage T. rex is in fact an adult specimen of a distinct tyrannosaur species. An exquisitely preserved skeleton of a small tyrannosaur from Montana’s 67-million-year-old Hell Creek Formation ends the debate, researchers report in Nature. The skeleton is part of a famous fossil known as Dueling Dinosaurs, featuring a small tyrannosaur entangled with its possible prey, a horned ceratopsian dinosaur. That tyrannosaur, the new analysis reveals, is a kind of holy grail, a long-sought-after missing link for researchers who’ve hoped to demonstrate that Nanotyrannus exists: It’s the first identified adult specimen of Nanotyrannus. And that is allowing researchers to at long last disentangle it from T. rex. …