Chondrichthyes have a skeleton made of cartilage.
Blacktip reef sharks are fast swimmers with paired pectoral and pelvic fins. Stingrays are bottom-dwellers that crush molluscs and crustaceans. Manta rays cruise in open water and scoop food into their mouth. Spotted ratfish feed on shrimps, molluscs, and sea urchins. Some species have a poisonous spine at the front of their dorsal fin.