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Fossil range: Late Permian
Restoration of Protorosaurus speneri.
| Scientific classification
In 1914, a new ceratopsian dinosaur found by Lawrence Lambe was again given the name Protorosaurus (in this sense meaning "before Torosaurus"). When Lambe found that the name had already been used for the early archosauromorph, he re-named his ceratopsian to Chasmosaurus.
Protorosaurus grew up to 2 meters (6.6 ft) in length, and was a slender, lizard-like animal, with long legs and a long neck. Its body form suggests that it was fast-moving, although it may have fed primarily on insects.