Classification of Sharks-Jaw species
Sharks have lurked beneath the seas ever since life began moving. Through their survival and evolution, sharks have adapted to their ever-changing environment time and again and have developed themselves in various forms. Today, there are over 400 species of sharks known worldwide. Sharks are classified as follows:

• Kingdom Animalia
• Phylum Chordata
• SubPhylum Vertebrata
• Class Chondrichthyes (cartilaginous fish)
• Subclass Plagiostomi (sharks and rays: upper jaw hung from skulls and different kind of blood)
• Superorder Selachimorpha (sharks: free upper eyelids, gill openings on the head, and pectoral fins separate from the side of the head)
• Subclass Elasmobranchii (upper jaw that is not fused to the braincase, no swim bladder, advanced electroreceptive system, a spiracle, skin with placoid scales, teeth modified placoid scales, and 5-7 separate slit-like gill openings on each side of the body: there are about 600 species of sharks, skates, and rays)