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Hybodus

Hybodus species grew to about 2 metres (6.6 ft) in length.
As one of the most bizarre prehistoric sharks, Hybodus had strange horns on the top of their heads. When they bit into large prey, they twisted to get a chunk of flesh. These predators had acute hearing, and the sound of splashing betrayed an animal in distress.

Hybodus sharks appeared at the end of the Permian and disappeared at the mid-Cretaceous. They are prey of larger predators which may explain why its dorsal fin evolved a spike - to make swallowing them harder.

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