- International Society for Arachnology (ISA)
Focuses on the arachnid orders Amblypygi, Araneae, Opiliones, Palpgradi, Pseudoscorpiones, Ricinulei, Schizomida, Scorpiones, and Uropygi, but not Acari.
- American Arachnological Society, The
Founded to promote the study of arachnids and to achieve closer cooperation and understanding between amateur and professional arachnologists.
Information and coordination agency for arachnid animals in general and scorpions in particular. In German and English.
- eNature.com: Insects and Spiders
Nature and wildlife field guide for a variety of insects and arachnids: water bugs, beetles, grasshoppers, ants, dragonflies, bees, ticks, spiders, and more.
- Tree of Life: Arachnida
Guide to the natural history of spiders, mites, scorpions, whipscorpions, and pseudoscorpions.
- Common Names of Arachnids 2003
Publication from the American Arachnology Society.
- Class Arachnida
Large Class of arthropods includes over 60,000 described species. Spiders make up the majority; closely followed by mites and ticks.
- Everything about Arachnids
Presents pictures, information, and characteristics of scorpions, spiders, mites, and ticks.
- Journal of Arachnology On-Line
Official journal of the American Arachnological Society.