5.2.13. The Scaphisoma unicolor species group

The group was established for two Japanese species (LÖBL 1970b). It includes at present a number of Asian species. They possess aedeagi with asymmetrical, narrow and elongate median lobe, usually have robust, prominent articular process and a small basal bulb. The parameres may be symmetrical or asymmetrical, usually lacking membranous lobes, and the internal sac is simple, consisting of a long flagellum, often to part extruded in repos.