Naturally selected and sexually selected wing structures synergistically enhance the attractiveness of katydid acoustic signals

Abstract Naturally selected adaptations are often thought to impair the elaboration of conspicuous sexual signals. In katydids, males produce acoustic signals by rubbing together structures on their forewings; specialized forewing cells then radiate this sound. These dedicated sound-producing structures are found on a physically distinct basal area of the forewing, but in many species, the remainder of the wing has evolved enormous, exaggerated blade-like or leaf-like structures under natural se