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Acarology
Acarological Society of America, Acarology Home Page, Systematic and Applied Acarology Society, Systematic Entomology Laboratory, USDA: Acari, The Acarological Society of Japan, The Acarology Laboratory, Ohio State University, Tick Research Laboratory, Ticks and Tick-borne Diseases
American Arachnological Society
Society information, articles from recent issues of the Journal of Arachnology, graduate study program list, ask-an-expert, arachnid photos, Brown Recluse ID, and links.
Arachnodata
Information and consulting agency for scorpions and other arachnid animals.
Arachnology Hub
Index to more than 1000 web sites related to arachnids.
British Arachnological Society
Promotes study of the Arachnida, particularly spiders, pseudoscorpions, and harvestmen.
David Richman's Site
Information about Arachnida research and photos of spiders and scorpions.
International Society for Arachnology
Scientific society devoted to the study of all arachnid orders except the Acari. Disseminates information and fosters communication among arachnologists.