4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡
是雌雄同体的，生殖系统适于体内受精。
起源的
（殖纲）大多是鱼的外
生。
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡是雌雄同体的，生殖系统适于体内受精。起源的（殖纲）大多是鱼的外生。
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