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Morphology of the sense organs in the proximal parts of the tibiae of Gryllus campestris L. and Gryllus bimaculatus deGeer (Insecta, Ensifera)



Morphology of the sense organs in the proximal parts of the tibiae of Gryllus campestris L. and Gryllus bimaculatus deGeer (Insecta, Ensifera)



Zoomorphologie: 893: 185-205



The tibial sense organs in the 3 pairs of legs from 2 cricket spp. G. campestris and G. bimaculatus were compared, with special emphasis upon the CoS marking technique. The arrangement of the sensilla seems to be associated with the burrowing habit of the crickets. The special cuticular differentiation (tympana, chitinous ridges) and the arrangement of the tracheal system in the vicinity of the auditory receptors (apposition of 2 tracheal tubes in direct communication with one another) seem to improve detection of airborne sound and may be important in the frequency analysis carried out by the ears. There are no such differentiated regions in the tibiae of the middle and hind legs. On all 3 pairs of legs each tibia bears a group of 14-15 campaniform sensilla; the groups have very similar spatial arrangements. Their nearness to the subgenual organ and the fact that they are incorporated into the tibial cuticle immediately proximal to the crease, indicate that they measure the loading of the tibia. The subgenual organs in all 3 pairs of legs consist of appr. 25 sense cells each; with their accessory structures, they are spread in a fanlike arrangement and their dendritic processes bend to run in the hemolymph canal. Only in the anterior tibia is there a complete tympanal organ, with a main process consisting of a row of 30-35 sense cells parallel to the long axis of the leg. Structures homologous to the caudal and frontal processes of the tympanal organ of the anterior tibia, with 25-30 sense cells, are found in the middle and hind tibia. It may be the main process responsible for detection of airborne sound by the forelegs. The sensory apparatus in the middle and hind legs that corresponds to the caudal and frontal branches of the tympanal organ may well mediate the residual sensitivity to airborne sound which remains after ablation of the tympanal organs.

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Accession: 021375054

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