Review of the genus Omosita Erichson (Coleoptera: Nitidulidae: Nitidulinae) in Korean fauna, with key to the Palaearctic species

•Omosita discoidea (Fabricius, 1775) is reported in Korea for the first time.•The adult of all three species with male and female genitalia are illustrated.•A Key to the Palearctic species of the genus Omosita is given.

The genus Omosita Erichson, 1843, which includes the sap beetle, Nitidulidae, is reviewed from Korea. Two species, Omosita colon (Linnaeus, 1758) and O. japonica (Reitter, 1874) are previously known from Korea, one species, O. discoidea Fabricius, is first recorded from Korea. A key to species from Korea and adjacent areas, re-descriptions, biology, illustrations of both males and females of the genus Omosita are provided. Some new distributional information for the range of Omosita colon, O. depressa (Linnaeus, 1758) and O. discoidea is included.