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Monacanthidae (filefish, leather-jacket; subclass Actinopterygii, order Tetraodontiformes) A family of deep-bodied marine to estuarine fish in which the first dorsal fin can be locked in an upright position by the small second spine. Several species are valuable food fish. There are about 85 species, all of which recently have been accommodated in the family Balistidae.

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