Abstract

The apical sensory cone on the antenna of a terrestrial isopod,Hemilepistus reaumuri, was investigated by both morphological and electrophysiological methods. It was found to consist of about 50 hair-like units, each containing 3–11 receptor cells which communicate with the environment through an apical porus. Single fiber recordings in the antennal nerve showed activity of receptor cells responding to mechanical, gustatory or olfactory stimuli. Two groups of olfactory and four groups of gustatory receptors were found.

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