Teeth grew from the scales of primitive shark-like fish millions of years ago, research by scientists suggests. Old lineage cartilaginous fish like sharks, skates and rays that have skin which ...
A fossil enthusiast recently discovered a fossilized tooth dating back 270 million years from a petalodont (petal-toothed) shark in the mountains of Qujing, Southwest China's Yunnan Province.
Josh Moyer, resident research scientist at the institute, inspected the tooth and determined it, too, was 10,000 to millions of years old. He also estimated it belonged to a shark that was "an ...