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That it's articulated from the waist down is remarkable. elengassen in Cretaceous era rocks ranging from 71.7 million to 74.9 million years old. In February 2018, paleontologists discovered S. Scientists Believe the Ankylosaur Died by a River 1).Īlso Read: Were Dinosaurs Killed by Volcanoes? Recent Study Disagrees The new species was reported in a paper published online in the journal Nature on Wednesday (Dec. The dinosaur's bones provide a previously unknown story about ankylosaur evolution, in addition to revealing its armored tail, according to Live Science.ĭuring the Jurassic period (201.3 million to 145 million years ago), the supercontinent Pangaea broke apart, resulting in extreme differences between ankylosaurs on the northern supercontinent Laurasia and those on the southern supercontinent Gondwana, such as this newly discovered species, Stegouros elengassen. And it would have looked a little like an Aztec sword, or the macuahuitl also called the Aztec club. Study co-lead researcher Alexander Vargas, a vertebrate paleontologist at the University of Chile's Department of Biology told Live Science the tail would have appeared like a sword because it's so flat. (Photo : Getty Images) The Untold Tale About Ankylosaur E volution