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Distribution and fine structure of antennal olfactory sensilla in japanese dung beetles geotrupes auratus mtos. coleoptera geotrupidae and copris pecuarius lew. coleoptera scarabaeidae



Distribution and fine structure of antennal olfactory sensilla in japanese dung beetles geotrupes auratus mtos. coleoptera geotrupidae and copris pecuarius lew. coleoptera scarabaeidae



International Journal of Insect Morphology and Embryology 16(2): 177-188



The distribution and fine structure of olfactory sensilla on the antennal flagella of the Japanese dung beetles, Geotrupes auratus (Coleoptera : Ceotrupidae) and Copris pecuarius (Coleoptera : Scarabaeidae) were studied by scanning and transmission electron microscopy. In both types of dung beetles, sensilla on the antennal segments were most abundant on the apical 3 lamellar segments, where sensilla basiconic were particularly concentrated. The sensilla were solely concentrated in the central part of the distal side of both the 9th and 10th segments in G. auratus and the 7th and 8th segments in C. pecuarius, respectively. The numbers of sensilla in these areas (channels) of the 9th and 10th segments in G. auratus were approximately 4,500 and 3,000, respectively. In C. pecuarius, there were about 1,900 sensilla on the 7th segment and 1,700 sensilla on the 8th. The cuticles of the sensilla in both species were perforated by numerous elongate pores, with a pore density of about 45/.mu.m2 in G. auratus and 30/.mu.m2 in 4C. pecuarius. Each sensillum basiconicum in C. pecuarius was generally associated with 2 sensory neurons. The sensory cilia passed into the sensillum lumen and branched profusely, occupying most of its space. On the basis of the fine structure and dense location, these sensilla are considered to have an olfactory function for food detection.

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Accession: 005174912

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DOI: 10.1016/0020-7322(87)90017-1


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