Three species belonging to two families of minute-sized spiders, viz, Theridiosoma fulvum (Araneae: Theridiosomatidae), Microdipoena ogatai and Microdipoena shenyang (Araneae: Mysmenidae), were discovered for the first time in Korea. Previously T. fulvum and M. ogatai were known to distribute only in Japan, M. shenyang only in China. All former records of Microdipoena jobi from Korea are misidentifications of M. shenyang. Detailed descriptions and photographs of three species are provided.

• Jun-Gi Lee(Interdisciplinary Program in Smart Agriculture, College of Agriculture & Life Sciences, Kangwon National University)
• Sam-Kyu Kim(Interdisciplinary Program in Smart Agriculture, College of Agriculture & Life Sciences, Kangwon National University, Department of Plant Medicine, Division of Bio-Resource Sciences, Kangwon National University)