The human pubic louse, on the other hand, is related to the gorilla louse, from which it parted company some 13 million years ago.

而体虱与大猩猩虱子有关系，1千3百万年前与大猩猩虱子分道扬镳。

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So biologists have long been puzzled over the fact that the human head louse is a sister species to the chimpanzee louse, but the pubic louse is closely related to the gorilla louse.

所以生物学家长期为此困惑：为什么人类的头虱是黑猩猩虱子的近亲。而阴虱却是大猩猩虱子的近亲。

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