Taxonomic review of the genus Octotemnus Mellié (Coleoptera: Tenebrionoidea: Ciidae) from Korea, with four unrecorded species associated with host fungi

The genus Octotemnus Mellié (Coleoptera: Tenebrionoidea: Ciidae) is taxonomically reviewed from Korea. We present six species of Korean Octotemnus , including four species new to Korea: Octotemnus assimilis Kobayashi & Sota, 2019, Octotemnus aculeatus Kawanabe, 2002, Octotemnus crassus Kobayashi & Sota, 2019, and Octotemnus robustus Kawanabe, 2002. Diagnoses for the four newly recorded species, a key to Korean Octotemnus , photographs for diagnostic characters of adult, line drawings of the male genitalia, and ecological information on their host fungi are provided. • Four species of genus Octotemnus Mellié, 1847 is firstly recognized from Korea. • A key to Korean species of Octotemnus , diagnoses for newly reported species, and photographs of adults are provided. • Ecological information, such as host fungi, for each species is provided.