The small shark named Clavusodens mcginnisi, or “McGinnis’ nail tooth,” only measured 3-4 inches in length. A 4 inch long male and female Clavusodens hunting for early crustaceans on the sea floor that once covered much of central Kentucky during the Middle Mississippian period, 340 million years ago. NPS Illustration / Benji Paysnoe ================================================================ MAMMOTH CAVE, KY. – A new-to-science species of ancient shark has been discovered through an ongoing Paleontological Resource Inventory (PRI) at Mammoth Cave National Park. The new species of obruchevodid petalodont, called Clavusodens mcginnisi, was identified by researchers through fossil teeth collected from deep inside the...