Styracosaurus was a relatively large dinosaur, reaching lengths of 5.5 meters (18 feet) and weighing nearly 3 tonnes. The function or functions of the horns and frills have been debated for many years. It had four to six long parietal spikes extending from its neck frill, a smaller jugal horn on each of its cheeks, and a single horn protruding from its nose, which may have been up to 60 centimeters (2 feet) long and 15 centimeters (6 inches) wide. Styracosaurus ( / s t ɪ ˌ r æ k ə ˈ s ɔːr ə s/ sti- RAK-ə- SOR-əs meaning "spiked lizard" from the Ancient Greek styrax/ στύραξ "spike at the butt-end of a spear-shaft" and sauros/ σαῦρος "lizard") is a genus of herbivorous ceratopsian dinosaur from the Cretaceous Period ( Campanian stage), about 75.5 to 75 million years ago.
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