Morphology of Some Rostrum Receptors in Dysdercus spp

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Abstract
The rostrum of Hemiptera forms part of a highly specialized feeding apparatus. When a phytophagous heteropteron commences feeding activity the tip of the rostrum is the first mouth part to touch the sub- strate. Because in Oncopellus fascialus the first contact between rostrum and substrate seems to provide the insect with essential information, decisive for its further feeding behaviour (BONGERS, 1969), one would expect the presence of contact chemoreceptors on the distal end of the rostrum. Indeed some receptor-like structures are found here in the case ofPyrrhocoris apterus (CossErr, 1953) and the present study describes their external morphology, as well as their innervation in Dysdercus fulfoniger and D. koenigii. No differences have been found between the two species with respect to the organs studied.

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