Hygroreceptors of adult sawtoothed grain beetles, Oryzaephilus surinamensis (L.) (Coleoptera, Cucujidae)

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Abstract
Two types of sense organs are present on the antennae of adult sawtoothed grain beetles, Oryzaephilus surinamensis. Sensilla chaetica are present on all the antennal segments and sensilla basiconica are present on the three segments which compose the antennal club. The intensity of the beetles' humidity response was correlated with the number of sensilla basiconica remaining after amputation of various numbers of antennal segments. On the basis of their morphology and the results of the amputation experiments, it is concluded that at least some of the sensilla basiconica function in hygroreception.

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