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，
殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的
虫。
词词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，殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的虫。
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