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，生殖系统适于体内受精。
的吸虫（殖纲）大多是鱼的外寄生虫。
词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，生殖系统适于体内受精。的吸虫（殖纲）大多是鱼的外寄生虫。
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