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Hybodus ("humped tooth") is an extinct genus of Chondrichthyans. First appearing towards the end of the Permian period, and disappearing during the Late Cretaceous. The Hybodus shark was especially successful for hundreds of milllions of years and could be found in shallow seas across the world. For reasons that are not fully understood, the hybodonts became extinct near the end of the Late Cretaceous period.
Hybodus species grew to about 2 meters (6.6 ft) in length, and are believed to have been opportunist predators. It was not a very big shark, but had the classic streamlined shark shape, complete with two dorsal fins that had large bony spines, believed for protection from even larger predators. Hybodus, was capable of eating a wide range of foods. They had two different types of teeth, suggesting a wide diet. The sharper teeth would have been used to catch slippery prey, while the flatter teeth probably helped them crush shelled creatures.