Abstract
Heretofore the genus Gnathagnus (Uranoscopidae) has been composed of three species: G. elongatus (Temminck et Schlegel) from northern Australia to Japan, G. innotabilis (Waite) from Australasia, and G. egregius (Jordan et Thompson) from the western Atlantic Ocean. In this paper, a new species and a new subspecies from northwestern Australia are described and a key to the known species and subspecies of the genus is presented.
