A new study proposes that the massive ancient shark was built more slenderly than a great white. But not all paleontologists ...

A rendering of Clavusodens mcginnisi, or “McGinnis’ nail tooth,” an ancient shark that stalked the ocean floor 340 million years ago. Rendering courtesy of the National Park Service A shark ...

But shark teeth come in many shapes and sizes ... And because they’re eating different foods, they need different types of teeth.’ Serrated teeth have a jagged edge - a bit like the blade of a bread ...

Scientists have found ancient nail tooth shark fossils deep inside Mammoth Cave in Kentucky, revealing new information about a mysterious group of extinct predators.

is a large and bulky shark, recognizable by its prominent, jagged teeth. Although they have attacked humans 36 times, none of these encounters have been fatal. Sand tigers are found in warm seas ...

The ancient predatory shark went extinct around 3.6 million ... the megalodon had serrations or jagged edges in its teeth, which previously led paleontologists to think that the two were related.