Background: The genus Monoctonus Haliday, 1833 is a small group which consists of 24 species worldwide. In South Korea, Chang and Youn (1983) recorded one species, M.similis Starý & Schlinger, 1967, but the evidence for identification of this species is doubtful and further confirmation is required (personal communication with Prof. Jong-Cheol Paik).
New information: An additional Monoctonus species is recorded as new to science from South Korea. Descriptions and illustrations of the new species -Monoctonuskoreanus sp. nov. - are provided, together with its mitochondrial cytochrome c oxidase subunit I (COI) data and phylogenetic position. A key to the female of the two species present in Korea is provided.
Keywords: DNA barcoding; parasitoid wasps; systematics; taxonomy.
Sangjin Kim, Jelisaveta Čkrkić, Željko Tomanović, Ju-Hyeong Sohn, Jongok Lim, Hyojoong Kim.