Sharks have no bones at all. Their skeletons are made of cartilage, which makes them lighter, more flexible and better suited ...

and new species are described every year. The difference between a shark and other fish: Unlike bony fish, sharks, rays, skates, and chimaeras are cartilaginous fish, meaning their skeletons are ...

Other types of bone-plated fish that lacked jaws ... living today belonged to two main nonarmored groups. The cartilaginous fish, so-called because cartilage formed their skeletons, later gave ...

Old lineage cartilaginous fish like sharks, skates and rays that ... "By labelling the different types of cells in the embryos of skate, we were able to trace their fates. "We show that ...