David Walter, University of Queensland Mites are the largest order, in terms of species, of the arachnids. Most people think only of spiders as arachnids.
Mites are another type.
Professor Walter offers dozens of images of these creatures here. Some text describing each species is also included. If you need information about an arachnid, mites offer a choice that should be different from your classmates. Thumbnail images enlarge upon clicking. Scans have been colorized.