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，
系统适于体内受
。单起源的吸虫（单纲）大多是鱼的外寄虫。
的；单性
的，单(
)的②单成的4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的，系统适于体内受。单起源的吸虫（单纲）大多是鱼的外寄虫。
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