4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
是雌雄同体
，生殖系统适于体内受精。单起源吸（单殖纲）大多是鱼外寄生。
,雄雌同体4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
是雌雄同体，生殖系统适于体内受精。单起源吸（单殖纲）大多是鱼外寄生。
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