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Morphological characteristics of final instar exuviae for four cicada species occuring in urban areas of central Korea
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/289871
Final instars of cicada typically emerge from the ground and metamorphose into adults. Exuviae are typically left on tree branches or leaves where metamorphosis takes place. We investigated morphological characteristics of final instar exuviae for the most prevalent species of cicada that occur in urban areas of central Korea: Cryptotympana dubia, Meimuna opalifera, Oncotympana fuscata, and Graptopsaltria nigrofuscata. The characters analyzed were body length, body width, distance between compound eyes, proboscis length, antennal segmentation, femoral structure, and body coloration. The results of Principal Component Analysis for body-size related characters, body length, body width, distance between compound eyes, and proboscis length, revealed that only the first component (PCA1) was significant. The distribution of PCA1 showed that there were three non-overlapping groups: C. dubia, a complex of O. fuscata and G. nigrofuscata, and M. opalifera. Although O. fuscata and G. nigrofuscata were not distinguishable based on size-related characters, these two species differed in femoral structure. That is, the angle between the femur and femoral claw were generally 120° in G. nigrofuscata, whereas it was usually 90° in the other three species. Exuviae of M. opalifera were pale brown and non-polishing, whereas exuviae of three other species were all brown and highly polishing. Therefor, the exuviae of four cicada species can be easily distinguishable based on body size, femoral structure, and body coloration.
