reproductive system

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马蹄螺为异体，其性生主要由精巢和输精管组成，没有交器，也没有其他的附属腺体。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是体的，生适于体内受精。单起源的吸虫（单纲）大多是鱼的外寄生虫。