Status and distribution of Smilosicyopus species are unclear, as they are rare, difficult to sample and to distinguish. During thirteen years, many specimens were collected by the MNHN and collaborators in Pacific islands, including samples in all type localities. These specimens were compared and COI gene sequenced. Seven out of the eight species known to date were confirmed, while S. mystax is considered a synonym of S. leprurus. Moreover, Smilosicyopus species have a broader distribution than previously thought and endemicity seems to be not the main rule in this genus. A key to species is provided.