Ryukyu endemic Mycalesis butterflies, speciated vicariantly due to isolation of the islands since 1.55 Ma

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  • 琉球固有種としてのMycalesis属のチョウ,それらの1.55Ma島嶼化による異所的種分化

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We analyzed the mitochondrial COI gene and drew phylogenetic trees of Mycalesis bushbrown butterflies in eastern Asia. In the Ryukyu islands, Mycalesis madjicosa amamiana is distributed on the Amami-Okinawa islands, and Mycalesis madjicosa madjicosa is distributed on the Yaeyama islands. In the phylogenetic tree, these Ryukyu endemic M. madjicosa species constitute a sister group with Mycalesis gotama distributed in Japan, Tsushima, southern Korea, southern China, Taiwan, and Viet Nam. This would reflect the isolation of the Ryukyu islands at 1.55 Ma, although speciation of Mycalesis madjicosa into two subspecies through the Kerama strait, and speciation of Mycalesis gotama nanda in Taiwan from the other M. gotama subspecies was probably delayed by 1 m.y. The Tsushima population of M. gotama fulginia is only slightly differentiated from the main Japan population, indicating that the Tsushima strait would act as only a mild barrier for Mycalesis.

Journal

  • Lepidoptera Science

    Lepidoptera Science 66 (1), 8-14, 2015

    THE LEPIDOPTEROLOGICAL SOCIETY OF JAPAN

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