Structure and distribution of antennal sensilla in Pseudosymmachia flavescens (Brenske) (Coleoptera: Scarabaeidae: Melolonthinae) |
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Authors: | Ya-Ya Li Kai-Min Shao Deguang Liu Li Chen |
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Affiliation: | 1. College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China;2. Department of Electronic Information and Electrical Engineering, Anyang Institute of Technology, Anyang, China;3. College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China;4. College of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding, China |
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Abstract: | Morphology, microstructure, and distribution of antennal sensilla were compared between female and male Pseudosymmachia flavescens (Brenske) (Coleoptera: Scarabaeidae: Melolonthinae). Lamellate antennae of P. flavescens were shown to have typical scape, pedicel, and flagellum segments. The flagellum consists of a four-segmented funicle and a three-segmented club. The lengths of their pedicel and funicle were found to be similar in females and males. Distinct sexual differences were observed in the length of lamellar segments. Nine types/subtypes of sensilla were identified on the antennae of both sexes, including Böhm sensilla, sensilla trichodea, sensilla basiconica (SB), and two subtypes for sensilla chaetica, sensilla coeloconica, and sensilla placodea each. Olfactory sensilla (e.g., SB and placodea) are mainly located on three lamellar segments of the antennal club. Variation was also seen in abundance of various types of antennal sensilla, with males possessing significantly more sensilla than females. Sensilla placodea were the most abundant, and their number in males was twice of that in females, showing a clear sexual dimorphism. The difference in the distribution of sensilla placodea might reflect their roles in sexual chemical communication. |
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Keywords: | chemoreception morphology scanning electron microscopy scarab beetle sexual dimorphism |
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