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crab louse
The crab louse (''Phthirus pubis'', also pubic louse) 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 eyelashes. Humans are the only known hosts of the crab louse, although a closely related species, ''Pthirus gorillae'', infects gorilla populations. The human parasite diverged from ''Pthirus gorillae'' approximately 3.3 million years ago.
==Description==
An adult crab louse is about 1.3–2 mm long (slightly smaller than the body louse and head louse), and can be distinguished from those other species by its almost round body. Another distinguishing feature is that the rearmost two pairs of legs of a crab louse are much thicker than the front legs and have large claws.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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