Chondrichthyes, more commonly known as cartilaginous fishes, are part of the phylum chordata. Their most distinguishing feature is that they have no bones in their body. Instead, they are comprised of completely cartilage. Other defining features include: jaws, paired fins and nostrils, scales, and chambered hearts. The most well-known cartilaginous fishes are sharks, but other species include rays, skates, and the interesting barrel-eyed fish.
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