Hybodus lived about 303.4 million to 66 million years ago and is possibly one of the longest-living prehistoric sharks of all time. It’s definitely the longest-living one on this list! The ...

The Jurassic shark, Hybodus, had a pair of small horns on its head while another species, Stethacanthus, had a dorsal fin shaped a lot like an iron. Weirdest of all was probably Helicoprion ...