Carcharocles megalodon. 185mm/7.3in. Miocene. Calif Shark's Tooth Hill. Buena Vista MNH.
Carcharodon megalodon, is a giant prehistoric shark that probably lived between about 20 to 2 million years ago, and was the apex predator in its time. It is recognized as the biggest known carnivorous fish to have ever existed. It is often termed the "megatooth shark".