Body long and thin, with a long tail filament. Body brownish above, lighter below, with a series of pale blue spots from the head to the dorsal fin on the midline of the back, a row of blue spots lateral to the mid-dorsal row, and two lateral rows of blue spots on the snout (F. tabacaria).
Size up to 2 m, including the tail filament.
A solitary species occurring over seagrass flats and reefs, also over hard and rocky bottoms. Feeds on fish, small crustaceans and other invertebrates.
Uncommon Florida, Bahamas and northern Caribbean, occasional southern Caribbean.