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Abstract
Abstract We have identified and characterized the hygroreceptive sensilla on the antenna of the adult male firefly, Luciola cruciata, by coupling extracellular electrophysiological recordings from single sensilla with observation of morphology of the sensilla using a field emission scanning electron microscope (FE-SEM). Seven morphologically different types of sensilla were present on the antenna: pored chaetic, poreless chaetic, basiconic, trichoid, capitular and campaniform sensilla and a new type of sensillum. To determine which is the hygroreceptive sensillum, responses to humidity changes were electrophysiologically recorded from each type of these sensilla. Impulses from moist and dry receptor cells could be obtained from only the capitular sensillum along with impulses from a cold receptor cell. The results clearly showed that the capitular sensillum is hygro- and thermoreceptive. The capitular sensillum had a cuticular apparatus that extends about 8 μm above the antennal surface and is externally ...
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