The genus Anaclasiger which is one of the myrmecophilous beetle (Clavigeritae) was described by Raffray in 1890 with the type species, A. sinuaticollis. Since then, only one species, A. zhudiae, had been added in this genus. The former species has known to distribute in Singapore (type locality), Taiwan (Raffray, 1914), Malaysia (Nomura & Idris, 2005), Thailand and Japan (Nomura et al., 2006), and the latter has been reported only in China (Yin et al., 2012). During specimens research of Korea National Arboretum, we were recognized one species, A. sinuaticollis, collected by pitfall trap in Mt. Geombong. Therefore, we are going to report this unrecorded genus and species for the first time from Korea. Both the information of the species including diagnosis, habitus and male genitalia, and that of the genus distribution on the map are going to be provided.

• Jun-Young Kang(Division of Forest Biodiversity, Korea National Arboretum, Department of Biological Sciences and Biotechnology, Chungbuk National University, Korea)
• Gyu Young Han(Division of Forest Biodiversity, Korea National Arboretum)
• Ji-Won Kang(Department of Biological Sciences and Biotechnology, Chungbuk National University, Korea)
• A Young Kim(Division of Forest Biodiversity, Korea National Arboretum)