According to the Shark Trust, sharks, skates and rays all belong to a subclass of Chondrichthyes known as the Elasmobranchii. The class Chondrichthyes consists of fish-like marine animals that have skeletons made up of c... More » Science Biology Zoology

Sharks are classified as vertebrates in the phylum Chordata. Although their skeletons are made of cartilage rather than hard bone, they are still considered vertebrates. More » Pets & Animals Marine Life Sharks

Fish that do not have scales include catfish, sharks, rays, chimaeras, skates, moray eels, sturgeons, paddlefishes, salifin blennies, combtooth blennies, hagfishes and lampreys. Many of these fish have evolved scale alte... More » Pets & Animals Marine Life Fish
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Three examples of cartilaginous fish are skates, rays and chimeras. There are many types of each of these cartilaginous fish. For example, stingrays, butterfly rays, manta rays and sawfish are all rays. More » Pets & Animals Marine Life Fish

Sharks are fish, but they belong to the group called Chondrichthyes, or cartilaginous fish, which is a different scientific group than most types of fish. Common fish, such as tuna or salmon, all belong to the group Oste... More » Pets & Animals Marine Life Sharks

Most sharks live in the ocean at depths no greater than 7,000 feet; very few sharks live below 10,000 feet. Sharks are found in all the world's oceans, from the Arctic to the Antarctic, and in some rivers and lakes. More » Science Biology Zoology

Sharks tend to live between 20 and 30 years, but the number and diversity of shark species makes it difficult to give a definitive answer on sharks as a whole. Notably, Spiny Dogfish and Whale Sharks can live to be over ... More » Science Biology Zoology