Body very elongated. Both jaws extremely long and pointed, forming a sharp beak shape. Dorsal and anal fins posterior in position opposite each other. Anterior rays much longer than the rest. Pectoral fin short. Caudal fin forked, lower lobe slightly larger than upper lobe. Numerous needle-like teeth in different sizes. Small cycloid scales, deciduous and easily detached.
back dark blue with silvery white belly.
common 60-80 cm (max. 120 cm).
Tylosorus acus: anterior lobes of dorsal and anal fins relatively short, 10.5-13.3 and 9.7-11.7 times, respectively, in body length (the distance from operculum margin to caudal fin base) (5.4-10.6 and 5.5-8.0 in T. choram).
Belone spp.: presence of gillrakers (absence in Tylosurus spp.); less than 20 dorsal rays.
BIOLOGY / ECOLOGY
Feeds mainly on pelagic fishes caught sideways in their long jaws. Large eggs with adhesive filaments; used to attach the eggs to floating objects.
epipelagic mainly in coastal water.