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Chasmosaurus was about 16 to 20 feet (5 to 6 meters) long, and weighed roughly 4 tons. A specimen found by Charles H. Sternberg in 1913, even includes some fossilized skin impressions - and from these it is believed that Chasmosaurus had rows of bony knobs (osteoderms) in parts of its skin.
When Chasmosaurus was first discovered in 1898 by Lawrence Lambe, it was initially believed to be a new species of Monoclonius. It was only after further fossils were found in 1913 and 1914, that it was realized that it was a separate genus. Additionally, when Agujiaceratops was discovered in 1938, it was believed to be a species of Chasmosaurus, and it was only when further Agujiaceratops fossils were found in 1991, that Agujiaceratops was placed in a separate genus from Chasmosaurus.
Chasmosaurus was a herbivore (plant-eater) that lived from 76 to 70 million years ago
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