虫状态
;
;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
，
殖系统适于内受精。单起源吸虫（单殖纲）大多是鱼外寄虫。
,外寄虫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，殖系统适于内受精。单起源吸虫（单殖纲）大多是鱼外寄虫。
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