4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡
是雌雄同体的，
系统适于体内受精。单起源的吸（单
）
多是
的外
。
亚
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡是雌雄同体的，系统适于体内受精。单起源的吸（单）多是的外。
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