The chimaeras (ghost sharks and spookfish) are a group of often deep sea fishes related to the sharks and rays. Unlike sharks, chimaeras have large, continuously growing tooth plates. These tooth plates have a very different structure to the teeth of sharks, or indeed any other fish. Within the teeth are sheets, rods and 'beads' of hard material that forms the cutting and biting surfaces. We shall be investigating the structure and development of these teeth and relating it to teeth of sharks.