4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡
雌雄同体
，生殖系统适于体内受精。单起源吸（单殖纲）大多
外
生。
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡雌雄同体，生殖系统适于体内受精。单起源吸（单殖纲）大多外生。
Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.
塔形马蹄螺为雌雄异体，其雄性生殖系统主由精巢和输精管组成，没有交接器，也没有其他附属腺体。
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