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Subclass Holocephali is a group of cartilaginous fishes under the class Chondrichthyes, commonly known as chimaeras or ghost sharks. They are distinguished from other cartilaginous fishes, such as sharks and rays, by several unique anatomical and physiological features. Members of Holocephali possess a single gill opening on each side of ______ ___ __________ ________ _____ ________ ___ ____ __________.
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