Scaphisoma

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 : 1343

5.2. Scaphisoma LEACH, 1815

The genus is almost world-wide in distribution with 640 described species and the most diverse of the subfamily. Its highest diversity is actually observed in the Oriental region though this may change when collections from other tropical regions will be adequately studied. Several species groups have been recognized, mostly based on male genital characters. The relationships are difficult to recognize in a number of species lacking clearly derived aedeagal characters, and species known in females only, remain unplaced.