Female, male and pupa of S. nanthaburiense sp. nov. A female B–F male G–I pupa. A mandible (right side) B hind basitarsus and second tarsomere (left side; lateral view) C coxites, styles and ventral plate (ventral view) D style (right side; ventrolateral view) E ventral plate and median sclerite (lateral view) F ventral plate (caudal view) G gill filaments (right side; lateral view) H terminal hooks (caudal view) I cocoon (dorsal view). Scale bars: 1.0 mm (I); 0.1 mm (B, G); 0.02 mm (C–F); 0.01 mm (A, H).