Chondrichthyes have a skeleton made of cartilage.
Blacktip reef shark (Carcharhinus melanopterus). Fast swimmers with acute senses, sharks have paired pectoral and pelvic fins.		Southern stingrays (Dasyatis americana) are bottom-dwellers that crush molluscs and crustaceans. Manta rays cruise in open water and scoop food into their gaping mouth.		Spotted ratfish (Hydrolagus colliei) feed on shrimps, molluscs, and sea urchins. Some species have a poisonous spine at the front of their dorsal fin.