Ptychodus went extinct around 85 million years ago. Coined the first real shark, Cladoselache lived more than 380 million years ago. While considered a shark, a Cladoselache has more in common ...

By the middle of the Devonian (380 million years ago), the genus Antarctilamna had appeared, looking more like eels than sharks. It is about this time that Cladoselache also evolved. This is the first ...