Deep beneath Kentucky’s rolling hills, in the dark reaches of Mammoth Cave National Park, paleontologists have unearthed the fossilized remains of two never-before-seen prehistoric shark species.

A strange prehistoric shark that lived during the age of dinosaurs is giving scientists new clues about how modern sharks evolved — and raising fresh questions at the same time. The small shark, known ...

A rare shark species thought to be wiped out due to overfishing has been spotted for the first time after over five decades in Papua New Guinea, shedding more light on the region’s rich biodiversity.

A newly examined prehistoric shark from the age of dinosaurs provides surprising insights into the early evolution of modern sharks. It cannot be confidently assigned to any shark order that exists ...