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