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Thyreophorans, often known simply as armored dinosaurs, are armored ornithischian dinosaurs in the group Thyreophora ("shield bearers") that lived from the early Jurassic Period until the end of the Cretaceous.

Thyreophorans are characterized by the presence of body armor lined up in longitudinal rows along the body. Primitive forms had simple, low, keeled scutes or osteoderms, whereas more derived forms developed more elaborate structures including spikes and plates. Most thyreophorans were herbivorous and had relatively small brains for their body size.

Thyreophora includes various subgroups, including the suborders Ankylosauria and Stegosauria. In both the suborders, the forelimbs were much shorter than the hindlimbs, particularly in stegosaurs. The clade has been defined as the group consisting of all species more closely related to Ankylosaurus than to Triceratops. Thyreophora is the sister group of Cerapoda within Genasauria.

The category that shows all the thyreophorans of the Jurassic Park franchise (including genetically-altered creatures containing thyreophoran DNA).

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