Determined the complete mtDNA sequence of 43 specimens of Protobothrops collected from 12 Japanese subtropical islands.
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P. flavoviridis and P. tokarensis form a distinct species group in the phylogeny of 12 Protobothrops species.
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Observed a significant genetic divergence of P. flavoviridis between the Amami Clade and the Okinawa Clade.
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All specimen of P. tokarensis are included in the Amami Cluster, suggesting the paraphyly of P. flavoviridis.
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The divergence time of the two clusters, 6.5 MYA, vastly precedes the geological vicariance of the islands, 1.5 MYA.
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