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“This actually means the stegosaurs and ankylosaurs independently evolved their broad feet.
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Animals like stegosaurs and ankylosaurs are commonly called broad-footed dinosaurs precisely because they share that trait, but Stegouros challenges that notion. When the fossil was first uncovered, researchers believed they might have found a completely different kind of dinosaur because the limbs weren’t at all what they expected. And the limbs are slender, the whole broad-footed condition that’s expected for ankylosaurs is absent.” “The beak is very narrow and it’s a bit curved, kind of eagle-like, while northern ankylosaur beaks are more duck-like. “The skull doesn’t have any osteoderms, none of the plates that are stuck to the skull which are common in ankylosaurs of the north,” Vargas told SYFY WIRE. The tail, however, represents only the beginning of the ways it is different from other ankylosaurs.
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Stegouros elengassen's unique tail structure consists of a flat surface with a series of sharp, pointed blades along each side, reminiscent of the macuahuitl, an Aztec war club. The results of its study were published in the journal Nature. It sheds light on the evolution of the so-called broad-footed dinosaurs, and has a wicked battle axe of a tail, to boot. Now, a newly discovered species called Stegouros elengassen is rewriting what we know about these ancient animals.Īlexander Vargas from the Department of Biology at the University of Chile, and colleagues, identified the new species based on an 80% complete skeleton uncovered in the Patagonian region of Chile.
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They’re most well known for their broad feet, weaponized tails, and being the most hardcore of all herbivorous dinosaurs. Ankylosaurs are armored dinosaurs most-closely related to stegosaurs.