Cartilaginous fish such as sharks and rays belong to the clade Chondrichthyes, which includes jawed fishes with paired fins and a cartilaginous skeleton.
Cartilaginous fish such as sharks and rays belong to the clade Chondrichthyes. This clade is diverse, including jawed fishes with paired fins and a skeleton made of cartilage, and it arose approximately 370 million years ago in the early or middle Devonian period. Chondrichthyes are descended from placoderms and have a secondarily derived evolutionary development with a lighter cartilaginous skeleton.
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