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Kraemeriidae (sand gobies; subclass Actinopterygii, order Perciformes) A small family of marine (rarely freshwater) fish that have a usually scaleless body, small eyes, and, typically, a strongly projecting lower jaw. Both dorsal and anal fins are long. Sand gobies are very small, burrowing fish, inhabiting sandy shallow waters. There are about 10 species, found in the Indo-Pacific region.