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Aulacorthum vandenboschi was recognized for the first time in Korea on Cirsium japonicum var. ussuriense in Jeju-do. The apterous viviparous female is redescribed, illustrated, and measured. To date, 15 species of the genus Aulacorthum have been recorded on the Korean Peninsula. A key to species of the genus Aulacorthum from the Korean Peninsula is provided.
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