Nialoe Tanaka, 1958 is a subgenus of the ground beetle genus Pterostichus (Coleoptera: Carabidae), endemic to East Asia. In a wide sense of Nialoe, it consists of more than 200 species, which has reduced hindwing and possibly diversified by geographical isolation due to poor dispersal ability. To understand this vast group, phylogenetic studies have been conducted, showing that Nialoe s. lat. comprises of five subgenera: Nialoe s. str., Sphodroferonia, Koreonialoe, and two unnamed subgenera. However, there is little knowledge regarding their origin and dispersal. In this study, we examine phylogenetic relationships among the five subgenera of Nialoe s. lat. based on 28S rRNA, wingless, COI, and 16S rRNA. The molecular clock and S-DIVA analyses are devised to investigate the biogeographical history of the group in East Asia. This study may give insight into the biogeographical dispersal and diversification of East Asian carabids.

The occurrence and newly described features, Pterostichus (Nialoe) tuuncatus Park et Kwon, 1996, was discussed and comprised with allied species by collection of Mt. Noaksan, vicinity of Sangju city, Korea.

A new pterostichine species, Pterostichus (Nialoe) jogaesanensis sp. nov., is described from Korea, with illustration of adult, its ma1e genitalia and last abdominal sternite.