Chondrichthyes

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Chondrichthyes or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone. The class is divided into two subclasses: Elasmobranchii and Holocephali (chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class).

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