Microscopic, elongated parasitic mite that is 0.00394-0.0178 in (0.1-0.4 mm) in length; worm-like appearance, with distinct head-neck part and body-tail part; long, tapering annulated abdomen. Adults possess four pairs of short legs (basically stumps) on head-neck part; legs contain tiny, but strong claws. Body is mostly semi-transparent. Needle-like mouthparts are used for eating skin cells; it is covered by cuticle surface that shows numerous striations. Bodies are layered with scales, which keeps them secured to follicles of hosts. Does not have excretory opening because its digestive system produces very little waste. Peritremes are absent, and palps (pedipalpi) are reduced in number and size.
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