Non-flashing
Guides
Photinus cookii
Cook's firefly
Photinus cookii, known as Cook's firefly, is a small day-active firefly species in the beetle family Lampyridae. Adults measure 5–7 mm and lack functional bioluminescent lanterns, a distinctive departure from typical nocturnal fireflies. The species was described by John Wagener Green in 1956 and named in honor of Carl Cook, who collected the holotype in Kentucky. It is one of the few known non-flashing fireflies, believed to locate mates using pheromones rather than light signals.