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Biogeographical History and Morphological Evolution of Two Closely Related Ostracod Species, Ishizakiella Ryukyuensis and I. Miurensis

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Abstract Individuals of the brackish water ostracod species Ishizakiella ryukyuensis are found sympatrically with those of the closely related species I. miurensis at the Kii Peninsula, western Japan, and possess a projection on the male copulatory duct. By contrast, individuals of this species recovered from the Nansei Islands, southern Japan, do not have such a projection. Molecular phylogenetic trees based on mitochondrial COI sequences consistently indicated that the populations at the Nansei Islands formed a paraphyletic group outside of a cluster consisting of the population at the Kii Peninsula. Thus, the development of the projection in the male copulatory organ is considered as a derived character for the individuals at the Kii Peninsula, and this feature may have been brought about by the sympatric distribution and a process of character displacement.

Affiliations: 1: Department of Earth and Planetary Sciences, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan; present address: Marine Ecosystems Dynamics, Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Tokyo 164-8639, Japan (


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