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Mites, along with ticks, belong to the subclass Acarina (also known as Acari) and the class Arachnida. Mites are among the most diverse and successful of all the invertebrate groups. They have exploited an incredible array of habitat, and because of their small size (most are microscopic) go largely unnoticed. Many live freely in the soil or water, but there are also a large number of species that live as parasites on plants, animals, and some that feed on mold.

Some of the plant pests include the so-called spider mites (family Tetranychidae), thread-footed mites (family Tarsonemidae), and the gall mites (family Eriophyidae). Among the species that attack animals are members of the Sarcoptic Mange mites (family Sarcoptidae), which burrow under the skin. Demodex mites (family Demodicidae) are parasites that live in or near the hair follicles of mammals, including humans. Perhaps the best-known mite, though, is the house dust mite (family Pyroglyphidae).

Insects may also have parasitic mites. Examples are Varroa destructor which attaches to the body of the honeybee, and Acarapis woodi (family Tarsonemidae), which lives in the trachea of honey bees. There are hundreds of species of mites associated with other bee species, and most are poorly described and understood. Some are thought to be parasites, while others beneficial symbionts.

There are over 45,000 described species of mites[31112]. Scientists believe that we have only found 5% of the total diversity of mites. Mites are believed to have existed for around 400 million years.

The scientific discipline devoted to the study of ticks and mites is called acarology.

The tropical species Archegozetes longisetosus is one of the strongest animals in the world, relative to its mass (100 μg): It lifts up to 1182 times its own weight, over five times more than would be expected of such a minute animal (Heethoff & Koerner 2007).

Systematics

In the usual taxonomy, the ticks form one of several superfamilies in the taxon comprising the mites. For the systematics of mites, see Acarina.

Allergy

Mites cause several forms of allergic diseases, including hay fever, asthma and eczema and are known to aggravate atopic dermatitis. Mites are usually found in warm and humid locations, including beds. It is thought that inhalation of mites during sleep exposes the human body to some antigens which eventually induce hypersensitivity reaction. Dust mite allergens are thought to be among the heaviest dust allergens.

Like most of the other types of allergy, treatment of mite allergy starts with avoidance. There is a strong body of evidence showing that avoidance should be helpful in patients with atopic dermatitis triggered by exposure to mites. Regular washing of mattresses and blankets with hot water can help in this regard. Antihistamines are also useful; Cetirizine, for example, is shown to reduce allergic symptoms of patients.However not all types of mites are infectious including the Alaskozetes antarcticus an arctic inhabiting mite.

Image:Rust Mite, Aceria anthocoptes.jpg|Rust mite

Aceria anthocoptesImage:Flat mite, Brevipalpus phoenicis.jpg|Flat mite

Brevipalpus phoenicisImage:House Dust Mite.jpg|House dust mite

Dermatophagoides pteronyssinusImage:Yellow mite (Tydeidae), Lorryia formosa.jpg|Yellow mite

Lorryia formosaImage:Yellow mite (Tydeidae) Lorryia formosa 2 edit.jpg|Yellow mite

Lorryia formosaImage:MitesMassing.jpg|Plant mites forming a reproductive colonyImage:Trombidium.spec.1706.jpg|Velvet miteImage:Convolvulus_arvenvis_with_mites.jpg|Convolvulus arvensis flower with velvet mites (Trombidium sp.)

See also



References



  • & (2007): Small but powerful – The oribatid mite Archegozetes longisetosus Aoki (Acari, Oribatida) produces disproportionate high forces. J. Exp. Biol. '210'(17): 3036–3042. (Abstract).


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