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Holocephali

subclass

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The subclass Holocephali ("complete heads") is a taxon of cartilaginous fish in the class Chondrichthyes. The earliest fossils are of teeth and come from the Devonian period. Little is known about these primitive forms, and the only surviving group in the subclass is the order Chimaeriformes. This group includes the rat fishes in the genus Chimaera, and the elephant fishes in the genus Callorhinchus. These fishes move by using sweeping movements of their large pectoral fins. Extant Holocephalians have long, slender tails and live close to the seabed feeding on benthic invertebrates. They lack a stomach, their food moving directly into the intestine.

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