Abstract
An undescribed goby has been collected from several localities in the western tropical Pacific, from Japan to Australia. This species is described as a new species, Fusigobius signipinnis.It differs from other species of Fusigobius in pectoral ray counts, colouration, largely separate pelvic fins, and shape of the first dorsal fin. The species is found in groups on sand, frequently flicking its first dorsal fin. Males are larger than females in mean size. Sex ratios are uneven, and females are twice as numerous as males.
