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
，生殖
于体内受精。单起源吸虫（单殖纲）大多是鱼外寄生虫。
,雄雌同体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，生殖于体内受精。单起源吸虫（单殖纲）大多是鱼外寄生虫。
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