Sharks are a group of elasmobranch cartilaginous fishes characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the …

Dec 21, 2025 · Shark, any of numerous species of cartilaginous fishes that make up the order Selachii (class Chondrichthyes). Most species have a tough skin that is dull gray in color and …

Sharks can rouse fear and awe like no other creature in the sea. Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some species are at risk of …

An annotated and illustrated catalogue of shark species known to date. by Leonard J.V. Compagno, Ph.D., the world’s foremost expert on sharks and Director of our Board of Trustees.

There are more than 500 species of sharks swimming in the world’s ocean. Yet when most people think of these cartilaginous fish, a single image comes to mind: a large, sharp-toothed and …

There are over 400 shark species worldwide. Learn how WWF protects sharks from threats like overfishing and habitat loss.

Jun 11, 2025 · Sharks are ancient, diverse predators with over 500 species. They're vital to ocean health—but slow to reproduce and threatened by overfishing.

Shark is the naming term of all members of Selachimorpha suborder in the subclass Elasmobranchii, in the class Chondrichthyes. The Elasmobranchii also include rays and …

Nov 19, 2024 · Sharks, having evolved in Earth’s oceans more than 400 million years ago, have changed little since their emergence. Their streamlined bodies were built for speed and …

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