Pthirus pubis is a small insect that lives on human body hair, particularly in the pubic area, and feeds on blood. It matters because infestations of this insect, commonly called pubic lice, are a sexually transmitted condition that causes itching and discomfort and requires treatment to eliminate.
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Crab Louse
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The crab louse or pubic louse (Pthirus pubis) is an insect that is an obligate ectoparasite of humans, feeding exclusively on blood. The crab louse usually is found in the person's pubic hair. Although the louse cannot jump, it can also live in other areas of the body that are covered with coarse hair, such as the perianal area, the general body hair, and the eyelashes (in children).
Humans are the only known hosts of the crab louse, although a closely related species, Pthirus gorillae, infects gorillas. The human parasite is thought to have diverged from Pthirus gorillae approximately 3.3 million years ago. It is more distantly related to the genus Pediculus, which contains the human head and body lice and lice that affect chimpanzees and bonobos.
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