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Kyphosidae (sea chub; subclass Actinopterygii, order Perciformes) A family of marine fish that generally have oval-shaped bodies, long and low second dorsal and anal fins, relatively short heads with a small mouth, and forked to notched tail fins. Many species are predominantly plant-feeding. Kyphosus incisor (yellow chub) of the western Atlantic is one of the larger species (90 cm). There are at least 31 species, found world-wide in warm to temperate waters.