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 »

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 »

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 »

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 »

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 »

www.reference.com Pets & Animals Marine Life Sharks

To some degree, sharks digest food similarly to humans. Food is taken into the stomach, where enzymes and other bio-agents break it down. Once this process has been accomplished, the resulting substance is guided into th... More »

Dorsal fins enable sharks and fish to remain upright as they swim through the water. These fins are vertical and help sharks and fish to balance as they move. In both animals, dorsal fins are located along the spine; mos... More »