Branchiobaetis javanicus comb. nov., male genitalia a subimaginal gonostyli crumpled under larval cuticle at earlier stage of development b subimaginal gonostyli extracted from larva starting to molt to subimago c genitalia of subimago, ventral view d genitalia of imago, ventral view e the same, apex of gonostylus f genitalia of imago, dorsal view. Abbreviations: gs1–gs3, segments of gonostyli; gv, gonovectis; m.gs, gonostylar muscle; m.sg, styligeral muscle; pgs, larval protogonostylus; usg, unistyliger.