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Chasmosaurus (KAZ-mo-sawr-us) is a ceratopsid dinosaur genus from the Upper Cretaceous Period of North America . Its name means 'opening lizard', referring to the large openings (fenestrae) in its frill (Greek chasma meaning 'opening' or 'hollow' or 'gulf' and sauros meaning 'lizard'). With a length of 5 - 6 metres and a weight of 3.6 tonnes, Chasmosaurus was a ceratopsian of average size. Like all ceratopsians, it was purely herbivorous. It was initially to be called Protorosaurus, however this name had been previously published for another animal.
