Arachnida (Arachnids) is a class of chelicerates. There are 75601 species of Arachnids, in 8122 genera and 822 families. It includes groups like Spiders, Mites, and Pseudoscorpions.
Definition: The institution that holds a type specimen for a given species. The recommended best practice is to use the identifier in a collections registry such as the Biodiversity Collections Index (http://www.biodiversitycollectionsindex.org/).