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
，生殖系统适于体内受
。
起
吸虫（殖纲）大多是鱼外寄生虫。
；
生殖，(亲生)殖②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，生殖系统适于体内受。起吸虫（殖纲）大多是鱼外寄生虫。
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