3.45" Cretaceous Shark (Hybodus) Dorsal Spine - Morocco
This is a really nice specimen with only one repaired crack near the tip. These spines are fragile so they are almost always fractured and most you see for sale are either heavily restored or composites.
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.