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。起的吸虫(殖纲)大多是鱼的外寄虫。
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的,殖系统适于体内受。起的吸虫(殖纲)大多是鱼的外寄虫。
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