Abstract

The orientation response after selective bilateral amputation of the antennae, maxillary palps and labial palps was used to determine the location of the CO2-receptive sensilla of larval Agriotes lineatus-obscurus (L.) and Limonius californicus (Mannerheim). The maxillary palps appear to be the most important for CO2 perception followed by the labial palps. The antennae did not appear to be involved in the orientation response. The CO2-receptive sensilla are likely among the cluster of sensilla at the tip of each palp. Scanning electron microscopy showed that there are more than twice the number of sensilla on the tip of the maxillary palp than on the tip of the labial palp of L. californicus larvae. The possible involvement of some of these sensilla in CO2 perception is discussed.

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