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Soleidae (sole; subclass Actinopterygii, order Pleuronectiformes) A fairly large family of mostly marine flatfish that have an oval-shaped body outline, with the dorsal fin originating well in front of the eyes, which are usually on the right side of the body. The small, twisted mouth is subterminal and located almost underneath the eyes. Soles are often found in shallow coastal waters. Several species are of commercial importance. There are about 117 species, distributed world-wide in temperate and tropical seas.