The genera and species of "Bullhead sharks"

This small family, consisting of 8 species, is restricted to temperate and tropical waters of the Pacific and the Indian Ocean. Bullhead sharks are often called "Port Jackson" sharks, since the first described species of this family was found in the named area of Australia. Bullhead sharks possess strong spines in front of their dorsal fins. Their heads look very dominant with big ridges above their eyes, and a broad pig-like snout with very large labial furrows. Bullhead sharks are considered an ancient or primitive group of sharks due to their hybodont type of teeth. Based on their heterogeneous teeth (their scientific name "hetero-dontus" stands for different shaped teeth) they are enable to crack and tear food. Bullhead sharks are bottom dwellers and show an oviparous (egg-laying) style of reproduction.