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15 April 2022 Introducing the World Arachnida Catalog: the new research environment for (almost all) arachnid orders
Danilo Harms, Wolfgang Nentwig, Daniel Gloor, Mark S. Harvey
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The World Arachnida Catalog (WAC, online at is introduced as an amalgamation of the highly successful World Spider Catalog (WSC), the Pseudoscorpions of the World Catalog, and the Smaller Arachnid Order Catalogs. The new catalogs present all available taxonomic information on eight arachnid orders (Amblypygi, Araneae, Pseudoscorpiones, Ricinulei, Palpigradi, Schizomida, Solifugae and Uropygi) in a single location and a standardized format, continuously updated by specialists, to members of the World Spider Catalog Association (WSCA). For the first time, the majority of taxonomic literature for Pseudoscorpiones and the smaller arachnid orders will be available in downloadable PDF format for members according to the Swiss copyright laws. Up-to-date counts of families, genera and species are given alongside the current taxonomy for each taxon. Now in a common place and presented in an almost unified format, the new catalog aims to become the primary repository of taxonomic information for the Arachnida and will hopefully stimulate arachnological research across all arachnid orders by removing boundaries imposed by literature accessibility, incompatibility of formats, or taxonomic jargon.

Danilo Harms, Wolfgang Nentwig, Daniel Gloor, and Mark S. Harvey "Introducing the World Arachnida Catalog: the new research environment for (almost all) arachnid orders," The Journal of Arachnology 50(1), 113-117, (15 April 2022).
Received: 8 October 2021; Accepted: 20 December 2021; Published: 15 April 2022
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