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Dinocerata(uintatheres; superorder Paenungulata, order Amblypoda) An extinct suborder of mainly N. American ungulates of the late Palaeocene to Eocene. Uintatherium was a grotesque animal resembling a rhinoceros in size and general appearance, ponderously built, with pairs of horn-like bony swellings on the upper side of the nasal, maxillary, and parietal bones of the skull.