Ghost sharks have evolved rows of true teeth on a bizarre forehead rod used for mating. Fossil and genetic evidence revealed the tenaculum’s teeth develop the same way as those inside the mouth, ...

Male "ghost sharks"—eerie deep-sea fish known as chimaeras that are related to sharks and rays—have a strange rod jutting from their foreheads, studded with sharp, retractable teeth. New research ...

When you consider animals that have a lot of teeth, sharks are likely to be the first ones that come to mind, since they can grow and shed thousands of teeth in their lifetime. However, as shocking as ...