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
。单起源吸虫（单殖纲）大多是鱼外寄生虫。
；单性生殖，单(亲生)殖②单
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。单起源吸虫（单殖纲）大多是鱼外寄生虫。
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