5.1" Hybodus Shark Dorsal Spine - Cretaceous

A complete fossil of Hybodus from Germany showing placement of spine. Image under GNU Free Documentation License
is a nice dorsal spine of the extinct Cretaceous aged shark Hybodus. These large spines helped to support the dorsal fins of the shark.

There are multiple repaired cracks through this specimen.

Hybodus grew up to 2 meters in length and was thought to have been a swift, opportunistic predator. It had a streamline shape which would have made it adept at hunting down fast prey as well as two different types of teeth which would have aided in eating a wide diet. The sharper teeth would have helped it catch soft prey like fish, while the flatter teeth would have worked well to crush shelled animals like ammonites. Hybodus first appeared during the Permian and went extinct at the end of the Cretaceous period.
Hybodus sp.
Taouz, Kem Kem Basin, Morocco
Kem Kem Beds
5.1" long
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