外寄生虫

In 2005, PAH enter China companion animal market by launching revolution, a high efficacy parasiticide for dog and cat.

2005年辉瑞动物保健集团正式进入中国宠物市场推出了用于驱除犬猫内外寄生虫的优质产品-大宠爱。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同的，生殖系统适于内受精。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。