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Temporal range: Early to Late Permian
Diplocaulus (meaning "double stalk") was not a dinosaur but an early amphibian, now extinct. It was distinguished by its boomerang-shaped head which was formed by two elongated bones at the back of the head. It had four short legs, and a short, flattened tail. It was about 3 feet (1 m) long.
- Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 55. .