Mites, historically Acari or Acarina, are a paraphyletic group that includes small arthropods from the arachnid subclass. The branch of zoology that studies mites is called acarology. There are many species of living things in the mite group, and the fossil record is known until the Devonian period. For this reason, acarologists have proposed a complex taxonomic classification system for the correct classification of mites.
Most organisms in the mite class are very small and are measured in micrometers. In addition, there are mites that can be larger than one centimeter, such as ticks and red velvet mites. More than 50 thousand species of mites have been recorded and it is thought that there are more than 1 million mite species. The size of the mite can be from 0.5 mm to 1 mm.