Sharks, rays, and skates form a group of boneless fishes called the elasmobranchs (Elasmobranchii). There are about 800 species of elasmobranchs, of which over half (between 450 and 500 species) belong to the Batoidea, a group that includes skates and rays. The rest of the elasmobranch species belong to the Superorder Selachimorpha, the sharks. Sharks, when compared to rays and skates, are designed more for speed and power. Many species rely on agility to capture prey.
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