Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays.
Lifespan: 20 – 30 years
Phylum: Chordata
Kingdom: Animalia
Superorder: Selachimorpha
