Elephant Shark Like A 'Living Fossil'; Callorhinchus Milii Hardly Changed For 400 Million Years

The elephant shark, a fish with a trunk-like snout found in the waters off southern Australia and New Zealand, is like a "living fossil," its genome hardly changed since it first evolved 400 million years ago. That's according to scientists who recently sequenced the shark's genome, making it the most primitive jawed vertebrate to have its DNA analyzed.