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，生
系统适于体
受精。
起源的吸虫（纲）大多是
的外寄生虫。
纲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，生系统适于体受精。起源的吸虫（纲）大多是的外寄生虫。
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