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ISSN : 1226-9999(Print)
ISSN : 2287-7851(Online)
Korean Journal of Environmental Biology Vol.35 No.4 pp.515-520

Sexual Size Dimorphism of the Mouthpart and Antenna of Cyllorhynchites ursulus in Korea

Ji Young Kim,Yung Kun Kim,Yoo Ran Lee,Eunok Lee


Sexual dimorphism of the mouthpart, antenna and mandible of the Cyllorhynchites ursulus in South Korea was studied with linear measurements. The mouthpart and antenna measurements were conducted with a stereoscopic microscope using 122 specimens (72 males and 50 females). Microscopic observation of the mandible were conducted with a Field Emission Scanning Electron Microscope (FE-SEM) using 103 specimens (73 males and 30 females). Results showed that the size difference between males and females was significant in the size of the mouthpart and antenna. On the other hand, we could not detect sexual size dimorphism in the microstructure of the mandible. The bivariate plots made by the result of Principal Component Analysis (PCA) and Discriminant Analysis (DA) showed a size dimorphism in the size of the mouthpart and the antenna between males and females. Based on our study, sexual dimorphism in the mouthpart and antenna exists in C. ursulus from the South Korean population, and this difference seems to be related to the behavioral differences between males and females.

한국에 서식하는 도토리거위벌레 (Cyllorhynchites ursulus) 구기 및 더듬이 길이의 성적이형성 연구