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
体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外
生虫。
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外生虫。
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