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
，
系统适于体内受
。单起源吸虫（单纲）大多是鱼外寄虫。
；单
，单(亲)②单成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，系统适于体内受。单起源吸虫（单纲）大多是鱼外寄虫。
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