The copulatory bursa of the male worms began to develop in the third stage larvae and became well developed in the 25-day young adults. The processes of the development of copulatory bursa were described.

• 雄虫的交合伞自第3期幼虫开始形成,到第25d的幼龄成虫才发育完成,本文对交合伞的形成过程进行了描述。