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Diplocaulus was an early amphibian distinguished by a boomerang shaped head formed by two elongated bones at the back of the skull. This odd shape may have been used as a hydrofoil allowing it to swim against the current. It also would have made it difficult for predators to swallow.

Diplocaulus was a tetrapod, an amphibian, a labyrinthodont, a lepospondyl, and a nectridian.
 

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