A new species of Hyposoter Foerster, 1869 is discovered based on morphology of adults and cocoons, biology, and DNA barcoding evidence. It is herein described as Hyposoter distriangulum Chen, Huang & Hsu sp. nov., which is a common parasitoid of a rare zygaenid moth Artona flavipuncta Hampson, 1900. The differences between similar Hyposoter species in Japan and Taiwan are also presented.
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