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
同体的，
殖系统适于体
。单起源的吸虫（单殖纲）大多是鱼的外
虫。
殖系统4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌同体的，殖系统适于体。单起源的吸虫（单殖纲）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异体，其
殖系统主要由巢和输管组成，没有交接器，也没有其他的附属腺体。
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