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  • Topic: Dinosaur, Triceratops, Cretaceous
  • Pages : 2 (391 words )
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  • Published : February 15, 2012
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Triceratops is a genus of herbivorous ceratopsid dinosaur which lived during the late Maastrichtianstage of the Late Cretaceous Period, around 68 to 65 million years ago (Mya) in what is now North America. It was one of the last dinosaur genera to appear before the great Cretaceous–Paleogene extinction event.[1] The term Triceratops, which literally means "three-horned face," is derived from the Greek τρί- (tri-) meaning "three", κέρας (kéras) meaning "horn", and ὤψ (ops) meaning "face".[2] Bearing a large bony frill and three horns on its large four-legged body, and conjuring similarities with the modern rhinoceros, Triceratopsis one of the most recognizable of all dinosaurs and the best known ceratopsid. It shared the landscape with and was preyed upon by the fearsome Tyrannosaurus,[3] though it is less certain that the two did battle in the manner often depicted in traditional museum displays and popular images. The exact placement of the Triceratops genus within the ceratopsid group has been debated by paleontologists. Two species, T. horridusand T. prorsus, are considered valid although many other species have been named. Recent research suggests that the contemporaneousTorosaurus, a ceratopsid long regarded as a separate genus, actually represents Triceratops in its mature form.[4][5] Triceratops has been documented by numerous remains collected since the genus was first described in 1889, including at least one complete individual skeleton.[6] Paleontologist John Scannella observed: "It is hard to walk out into the Hell Creek Formation and not stumble upon a Triceratops weathering out of a hillside." Forty-seven complete or partial skulls were discovered in just that area during the decade 2000–2010.[7] Specimens representing life stages from hatchling to adult have been found.[8] The function of the frills and three distinctive facial horns has long inspired debate. Traditionally these have been viewed as defensive weapons against predators. More recent...
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