;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。
物,外虫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。
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