Reproductive system of Apis cerana indica drones, A. in situ preparation, B. Diagram showing opening of mucus glands and seminal vesicle into the lateral ejaculatory ducts. MG, mucus gland; T, testis; SV, seminal vesicle; LED, lateral ejaculatory duct; MED, median ejaculatory duct; PB, penis bulb; DP, distal region; PP, proximal region; MS, mucus secretion.