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Chasmosaurus

Chasmosaurus ( ) is a genus of ceratopsiddinosaur from the Late CretaceousPeriod in North America. Its given name means 'opening lizard', referring to the large openings (fenestrae) in its frill (Greekchasma, meaning 'opening', 'hollow', or 'gulf'; and sauros, meaning 'lizard').

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