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Any of various herbivorous ornithischian dinosaurs of the group Ankylosauria of the Jurassic and Cretaceous Periods, having a squat armored body, a short neck, and a beaked mouth. Also called ankylosaur.

[From New Latin Ankylosauria, group name, from Ankylosaurus, type genus; see ankylosaurus.]

an′ky·lo·saur′i·an adj.
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Witmer and Ridgely examined skulls from two predators, Tyrannosaurus rex and Majungasaurus, and two ankylosaurian dinosaurs, Panoplosaurus and Euoplocephalus, both plant eaters with armored bodies and short snouts.