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
雄
的，生殖系统适于内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。
株的,雄
的4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雄的，生殖系统适于内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。
声
：
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