While the non-avian dinosaurs are long gone, sharks are still going strong. They’ve been around longer than trees (which first appeared about 400 million years ago), longer than the rings of Saturn ...

Ancient relative of the great white shark Most species of Ptychodus lived between 100 and 80 million years ago during the late Cretaceous period.The deposits in which the fossils were discovered ...

Ancient relative of the great white shark Most species of Ptychodus lived between 100 and 80 million years ago during the late Cretaceous period.The deposits in which the fossils were discovered ...

By Taylor Nicioli, CNN (CNN) — During the Cretaceous Period, a genus of sharks roamed the sea with rows of unusual teeth. Mostly large and rounded, these chompers were not meant to slice through ...

Paleontologists discovered two new species of ancient sharks and put together research using the sharks' fossilized teeth and even a set of gills found in the depths of Mammoth Cave National Park ...

The sharks, from the genus Ptychodus, were first discovered in the mid-eighteenth century.Descriptions of this genus were largely based on their teeth — which could be nearly 22 inches (55 ...

But new research suggests the prehistoric predator was leaner, and slower, than its modern-day stand-in. “A great white is bulky,” said Phil Sternes , a shark biologist and co-author of a ...