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
同
的，生殖系统适于内受
。
源的吸虫（殖纲）大多是鱼的外
生虫。
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌同的，生殖系统适于内受。源的吸虫（殖纲）大多是鱼的外生虫。
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异，
性生殖系统主要由巢和输管组成，没有交接器，也没有他的附属腺。
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