Synodus intermedius, the sand diver, is a species of fish in the lizardfish family, Synodontidae, a basal ray-finned fish in the class Actinopterygii. The etymology of Synodus is of Greek origin: "syn", symphysis or grown together, and "odous" which means teeth. Sand divers inhabit subtropical marine ecosystems, (37°N-17°N), including sandy bottom areas on continental shelves, coral reefs, estuaries, bays, and reef structures.