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Mites, along with ticks, are small arthropods belonging to the subclass Acari (also known as Acarina) and the class Arachnida. The scientific discipline devoted to the study of ticks and mites is called acarology. In soil ecosystems, mites are favored by high organic matter content and by moist conditions, wherein they actively engage in the fragmentation and mixing of organic matter.
Diversity and ecology
Mites are among the most diverse and successful of all the invertebrate groups. They have exploited an incredible array of habitats, 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. It is estimated that 48,200 species of mites have been described.
Mites occupy a wide range of ecological niches. For example, Oribatid mites are important decomposers and occur in many habitats. They eat a wide variety of material including living and dead plant and fungal material, lichens and carrion; some are even predatory, though no species of Oribatida mite are parasites. 
Many mites which have been well studied are parasitic on plants and animals. One family of mites Pyroglyphidae, or nest mites, live primarily in the nests of birds and animals. These mites are largely parasitic and consume blood, skin and keratin. Dust mites, which feed mostly on dead skin and hair shed from humans instead of consuming them from the organism directly, evolved from these parasitic ancestors.
Insects may also be infested by parasitic mites. Examples are Varroa destructor, which attaches to the body of the honeybee, and Acarapis woodi (family Tarsonemidae), which lives in the tracheae 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. Mites also parasitize some ant species, such as Eciton burchellii.
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. Acari are mites, except for the three families of ticks.
The tropical species Archegozetes longisetosus is one of the strongest animals in the world, relative to its mass (100 μg): It lifts up to 1,182 times its own weight, over five times more than would be expected of such a minute animal. Mites also hold the record speed; for its length, Paratarsotomus macropalpis is the fastest animal on Earth.
The majority of mite species are harmless to humans, but a few species of mites can colonize humans directly, act as vectors for disease transmission, or cause or contribute to allergenic diseases.
Mites which colonize human skin are the cause of several types of skin itchy rashes, such as grain itch, grocer's itch, and scabies. Sarcoptes scabiei is a parasitic mite responsible for scabies which is one of the three most common skin disorders in children. Demodex mites, which are common cause of mange in dogs and other domesticated animals, have also been implicated in the human skin disease rosacea, although the mechanism by which demodex contributes to the disease is unclear.
Chiggers are known primarily for their itchy bite, but they can also spread disease in some limited circumstances, such as scrub typhus. The house-mouse mite is the only known vector of the disease rickettsialpox. 
Dust mites cause several forms of allergic diseases, including hay fever, asthma and eczema, and are known to aggravate atopic dermatitis. House dust 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 that eventually induce hypersensitivity reaction.
- Grain itch
- Grocer's itch
- Copra itch
- Chigger bite
- List of mites associated with cutaneous reactions
- Nyle C. Brady & Ray R. Weil (2009). Elements of the Nature and Properties of Soils (3rd Edition). Prentice Hall. ISBN 9780135014332.
- R. B. Halliday, B. M. OConnor & A. S. Baker (2000). "Global Diversity of Mites". In Peter H. Raven & Tania Williams. Nature and human society: the quest for a sustainable world : proceedings of the 1997 Forum on Biodiversity. National Academies. pp. 192–212.
- Arroyo, J.; Keith, A.M.; Schmidt, O.; Bolger, T. (2013). "Mite abundance and richness in an Irish survey of soil biodiversith with comments on some newly recorded species". Ir Nat. J 33: 19–27.
- Erickson, Jim. "Genetic study of house dust mites demonstrates reversible evolution". Michigan News. Retrieved 31 May 2014.
- Michael Heethoff & Lars Koerner (2007). "Small but powerful – the oribatid mite Archegozetes longisetosus Aoki (Acari, Oribatida) produces disproportionate high forces". Journal of Experimental Biology 210 (17): 3036–3042. PMID 17704078. doi:10.1242/jeb.008276.
- Andrews RM, McCarthy J, Carapetis JR, Currie BJ (December 2009). "Skin disorders, including pyoderma, scabies, and tinea infections". Pediatr. Clin. North Am. 56 (6): 1421–40. PMID 19962029. doi:10.1016/j.pcl.2009.09.002.
- PMID 20666166 (PubMed)
- Paul Klenerman, Brian Lipworth. "House dust mite allergy". NetDoctor. Retrieved February 20, 2008.
- "Hypersensitivity reaction to mite allergens". Allergy Guide. Retrieved February 20, 2008.
- Bitingmites.org: What's biting you?
- Michael F. Potter. "Parasitic mites of humans". University of Kentucky.
- Red velvet mite – Trombidium sp. diagnostic photographs
- Worldwide honey bee decline due to mite infestations – article, photographs
- Mites and Ticks chapter in United States Environmental Protection Agency and University of Florida/Institute of Food and Agricultural Sciences National Public Health Pesticide Applicator Training Manual
- Mites at the US National Library of Medicine Medical Subject Headings (MeSH)