Scaphisoma tricolor

Ivan Löbl & Ryo Ogawa, 2016, On the Scaphisomatini (Coleoptera, Staphylinidae, Scaphidiinae) of the Philippines, IV: the genera Sapitia ACHARD and Scaphisoma LEACH, Linzer biologische Beiträge 48 (2), pp. 1339-1492 : 1432

5.2.21. The Scaphisoma tricolor species group

This group includes several Southeast Asian and one Mascarene species (see LÖBL 1986, 2015b), possessing strongly asymmetrical aedeagi, with parameres that may bear strongly sclerotized ventral apophysis and are expanded by large, dorsally overlapping lobes. The basal bulbs are very large and usually moderately sclerotized, with a ventral ridge, the apical processes of the median lobes are bifid, with the dorsal branch comparatively small, and the internal sacs are complex, bearing sclerotized pieces. The species may exhibit unusual sexual polymorphism in their colour pattern and in the shape of the inner apical angles of the elytra that are rounded in males, while they may be denticulate in females. In addition, the male mesotibiae may be notably thicker than male metatibiae or female mesotibiae, the apical abdominal segments are enlarged, and the sternite 6 is expanded apically by a broad lobe.