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Aulostomidae (flutemouth, trumpetfish; subclass Actinopterygii, order Syngnathiformes) A family of marine tropical fish characterized by a very elongate body, a long compressed snout, a series of isolated dorsal spines, and a rounded tail fin. Found mainly in reefs or inshore rocky areas, they can be encountered swimming in an almost vertical position, hidden by sea-grass leaves or coral branches. There are about four species.