;
白色的;4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是
体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。
株的,体的4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。
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