4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的，
统适于体内受精。单起源的吸虫（单纲）大多是鱼的外
虫。
统4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的，统适于体内受精。单起源的吸虫（单纲）大多是鱼的外虫。
Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.
摘要塔形马蹄螺为雌雄异体，其雄性统主要由精巢和输精管组成，没有交接器，也没有其他的附属腺体。
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