Jean and Fred   cc-by-nc-2.0

Arachnida (Arachnids) is a group of spiders. There are 73556 species of arachnids, in 7711 genera and 860 families. This group has been around since the Telychian Age. Arachnids includes groups like Harvestmen, Pseudoscorpions, and Scorpions.

EOL has data for 18 attributes, including:

Known occurrences, collected specimens and observations of arachnids