biostudies-literaturePyo JYMinistry of Agriculture, Food and Rural Affairs733https://www.ebi.ac.uk/biostudies/studies/S-EPMC10531817biostudies-literatureUnknown14(9)In South Korea, both <i>Sympetrum depressiusculum</i> Sélys, 1841 (Odonata: Libellulidae), which is distributed throughout Europe and from Russia to the Korean Peninsula, and <i>Sympetrum frequens</i> Sélys, 1883, which is endemic to Japan, are recorded. However, the identity of South Korean populations and the validity of listing the two species have not yet been settled. In this study, we collected seventy-four individuals of <i>Sympetrum</i> species from South Korea (five localities), Russia, The Netherlands, and Japan. These samples were examined for morphology and sequenced for partial <i>COI</i>, <i>16S rRNA</i>, and a nuclear internal spacer (ITS) region, after which these molecular data were combined with available public data from Russia, Japan, and The Netherlands. Major morpholoInsectsIdentification of <i>Sympetrum depressiusculum</i> Selys, 1841 in South Korea (Odonata: Libellulidae) According to Morphology and Genetic Markers.PMC10531817321001-03Kim JMSong YKKim SSPyo JYKim IPark JSfalseIdentification of <i>Sympetrum depressiusculum</i> Selys, 1841 in South Korea (Odonata: Libellulidae) According to Morphology and Genetic Markers.In South Korea, both <i>Sympetrum depressiusculum</i> Sélys, 1841 (Odonata: Libellulidae), which is distributed throughout Europe and from Russia to the Korean Peninsula, and <i>Sympetrum frequens</i> Sélys, 1883, which is endemic to Japan, are recorded. However, the identity of South Korean populations and the validity of listing the two species have not yet been settled. In this study, we collected seventy-four individuals of <i>Sympetrum</i> species from South Korea (five localities), Russia, The Netherlands, and Japan. These samples were examined for morphology and sequenced for partial <i>COI</i>, <i>16S rRNA</i>, and a nuclear internal spacer (ITS) region, after which these molecular data were combined with available public data from Russia, Japan, and The Netherlands. Major morpholo2023-01-01T00:00:00Z2023 Aug2026-05-13T14:30:45.379Z2025-02-18T23:59:35.853ZS-EPMC105318173775470210.3390/insects14090733