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，生殖
于体内受
。
起源的
（殖纲）大多是鱼的外寄生。
性生殖的，(亲生)殖的②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.
涡是雌雄同体的，生殖于体内受。起源的（殖纲）大多是鱼的外寄生。
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