Jd. Hopkins et al., INTERNAL REPRODUCTIVE-SYSTEM OF THE ADULT MALE LESSER MEALWORM ALPHITOBIUS-DIAPERINUS (COLEOPTERA, TENEBRIONIDAE), Journal of the Kansas Entomological Society, 66(4), 1993, pp. 446-450
The adult male reproductive system of the lesser mealworm consists of
paired testes (each with six follicles), vas efferens, vas deferens, t
wo pairs of accessory glands (bean-shaped and tubular), ejaculatory du
ct, and aedeagus. The accessory glands closely resemble those of Teneb
rio molitor L. and are thought to play a role in spermatophore formati
on. Seven days after adult emergence the follicles of the testes conta
ined motile sperm. Males had completely tanned by five days and initia
ted mating with females seven days after emergence.