Shark, ray

Sharks and rays: animals with cartilage instead of bones (phylum Chordata, class Chondrichthyes), and eels (phylum Chordata, class Cyclostomata).

• What types of sharks and rays are there?
  shark ray stingray skate chimera
• What types of eels are there?
  eel electric eel slime eel hagfish lamprey
• What words describe sharks and rays?
  cartilaginous ray-finned soft finned