|Flagfins are elongate, cylindrical fishes that closely resemble the lizardfishes. Most are deep sea fishes and can be found up to depths of 1000 m (3300 ft). Their mouths are large with many pointed, depressible teeth. They are bottom dwellers and usually bury themselves in sand and rubble to ambush their prey. Their sexes are separate, and they exhibit sexual dimorphism (differentiation) in body shape, fin colors and the shape of their dorsal, anal and pelvic fins. Because they live at such great depths, little is known about their biology and behavior.