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Trichonotidae (sand diver; subclass Actinopterygii, order Perciformes) A small family of marine fish that have an elongate, thin body, a pointed snout, and long-based second dorsal and anal fins. The spines of the first dorsal fin may be rather long. Sand divers are found on the sea-bottom, but tend to disappear into the mud very quickly when disturbed. There are about 19 species, occurring in tropical to subtropical seas.