This genus is
diagnosed by a large adult size, which is around wide and largely consisting of a
wing-like
rhomboidal "disc" (
pectoral fins). The
trunk is broad, depressed, and thick. The head protrudes forward
anteriorly, is narrow, and elevated above the disc, which connects with the head at the level of the eyes. The
spiracles are located dorsally and angles towards the sides. The mouth is broad, located
ventrally, contains a single
tooth plate row, and is surrounded by sensory pores and papillae. The
internasal flap possesses a deep "V" shaped notch. A single
dorsal fin arises near the base of the very long
whip-like tail, which is armed by one or more
stinging barbs. }} ==See also==