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Nature 393, 782-783 (25 June 1998) | doi:10.1038/31684;

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Skull of a Jurassic ankylosaur (Dinosauria)

The origin and early evolution of many major dinosaur groups are poorly known because specimens are rare. One of these groups, the Ankylosauria, or armour-plated dinosaurs, is best known from well-preserved specimens from the Upper Cretaceous period of Asia and North America. Here we describe a well-preserved skull of an earlier, Late Jurassic ankylosaur, which will be important in clarifying the early history of this group. The specimen, Gargoyleosaurus parkpini gen.

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