Abstract
A new species of Cybaeus spiders collected from Mt. Odaesan, C. aratrum sp. nov., is described with detailed illustrations, leg spination, trichobothrium patterns and SEM photographs. This species can be distinguished from other Cybaeus species by male palpal conductor largely developed plow-like with twisted distal part, embolar tip injector-like, and patellar apophysis with 44 protuberances on the distal part. A key to the species of Korean cybaeid spiders is provided.
