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精。单起源吸虫（单殖纲）大多是鱼
生虫。
,雄雌同体
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，生殖系统适于体内受精。单起源吸虫（单殖纲）大多是鱼生虫。
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