生殖系统
Reproductive system: Penis is more or less long, usually cylindrical, with appendix (flagellum) at its terminal end. Vas deferens is inserting laterally (subterminally). Retractor connects at appendix. Vagina is usually shorter, surrounded by a vaginal gland in its posterior part. Spermatheca duct is usually short and usually inserting in the zone covered by the vaginal gland. The spermatheca is spherical or ovoid. Oviduct is usually short and sometimes thinner than penis and vagina. Atrium is short.