Subclass Holocephali

Subclass Holocephali is a group of cartilaginous fish that includes species commonly known as chimaeras, ghost sharks, or ratfish. They belong to the class Chondrichthyes, which also includes sharks and rays, but they are distinct due to their unique features. Holocephali is characterized by having a single gill opening on each side of the body, unlike other cartilaginous ___ __________ _________ __________ __________ ________.
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