While a number of marine animals, such as sharks, rays, and whale sharks , have external tooth like structures called denticles, it turns out the spotted ratfishs toothy features are straight up true teeth, as true as the ones in your mouth. And they use them for sex. Researchers have revealed that the structures on the male spotted ratfishs tenaculum—an appendage on its forehead—are real teeth. This discovery could have significant implications for the evolutionary history of teeth. Plus,...
