Males have two tail segments that glow quite conspicuously; in females, only one tail segment has a light-emitting organ. They die immediately after mating and egg laying.
成蟲的雄蟲尾部有 2 節發光器，光度較顯眼；雌蟲尾部只有一節發光器，交配完成、產卵後即死亡。