The Acari are a sub-class of the class Arachnida and are more commonly known as the mites and ticks. Ticks are exclusively ectoparasitic but there are both free living and parasitic mites.

The specific branch of science devoted to the study of the Acari is called Acarology.

An overhead view of the _Lorryia formosa_ mite. Magnified about 200x.

An overhead view of the Lorryia formosa mite. Magnified about 200x.
Photograph by Erbe & Pooley: United States Department of Health and Human Services.

Other names for (or types of) Acari include:

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