Nephrotoma didyma Yang & Yang, 1987. 20 Hypopygium, lateral view 21 outer gonostylus, lateral external view 22 tergite 9, dorsal view, softened 23 hypopygium, ventral view 24 inner gonostylus, lateral external view, softened 25 inner gonostylus, lateral external view, before softened. Scale bars: 0.5 mm (20, 22, 23); 0.1 mm (21, 24, 25).