Definitions for acariˈæk əˌraɪ
This page provides all possible meanings and translations of the word acari
Random House Webster's College Dictionary
Ref: pl. of acarus .
Plural form of acarus.
Acari are a taxon of arachnids that contains mites and ticks. The diversity of the Acari is extraordinary and its fossil history goes back to at least the early Devonian period. As a result, acarologists have proposed a complex set of taxonomic ranks to classify mites. In most modern treatments, the Acari is considered a subclass of Arachnida and is composed of two or three superorders or orders: Acariformes, Parasitiformes, and Opilioacariformes; the latter is often considered a subgroup within the Parasitiformes. The monophyly of the Acari is open to debate, and the relationships of the acarines to other arachnids is not at all clear. In older treatments, the subgroups of the Acarina were placed at order rank, but as their own subdivisions have become better-understood, it is more usual to treat them at superorder rank. Most acarines are minute to small, but the largest Acari may reach lengths of 10–20 millimetres. It is estimated that over 50,000 species have been described and that a million or more species are currently living. The study of mites and ticks is called acarology, and the leading scientific journals for acarology include Acarologia, Experimental and Applied Acarology and the International Journal of Acarology.
U.S. National Library of Medicine
A large, subclass of arachnids comprising the MITES and TICKS, including parasites of plants, animals, and humans, as well as several important disease vectors.
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