In order to define the eastern limit of the distribution of C. s. servilia (2nd = 25, XO) and the western limit of C. s. mariannae (2nd = 24, neo-XY), the karyotypes were studied in specimens from Cheju island and the mainland of the Republic of Korea, and from the islands of North Kyushu, Japan. The dividing line between the 2 sspp. appears in the Korea Strait, between the Korean mainland and Tsushima island. The mechanism of maintaining a distinct karyomorph in each area of distribution is discussed in details.


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Societas Internationalis Odonatologica

K. Higashi, C.E. Lee, H. Kayano, & A. Kayano. (2001). Korea Strait delimiting distribution of distinct karyomorphs of Crocothemis servilia (Drury) (Anisoptera: Libellulidae). Odonatologica, 30(3), 265–270.