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In wet habitats, larger species construct mud towers above ground to aerate their burrows. In the final nymphal instar, they construct an exit tunnel to the surface and emerge. [11] They then molt (shed their skins) on a nearby plant for the last time, and emerge as adults.
A few mite species lack an anus: they do not defecate during their short lives. [27] The circulatory system consists of a network of sinuses and most mites lacks a heart, movement of fluid being driven by the contraction of body muscles. But ticks, and some of the larger species of mites, have a dorsal, longitudinal heart. [28]
They do not burrow into the skin or suck blood, as is commonly assumed. Itching from a chigger bite may not develop until 24–48 hours after the bite, so the victim may not associate the specific exposure with the bite itself. [15] The red welt/bump on the skin is not where a chigger laid eggs, as is sometimes believed. [25]
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Sarcoptic mites as adults are microscopic, nearly circular in outline, and their legs are short, adapted for burrowing. [6] The females, after mating with males on the surface of their host's skin, burrow into the living layers of the epidermis (mainly the stratum spinosum). They make long tunnels horizontal to the surface of the skin.
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The burrowing is carried out using the mouth parts and special cutting surfaces on the front legs. While these are being used, the mite anchors itself with suckers on its feet. Eggs are laid in small numbers as the mite burrows, and, as these hatch, six-legged larvae climb out on to the skin and search for hair follicles, where they feed and ...