Class Arachnida

Spiders, like ticks, are arachnids not insects. Arachnids have eight legs and two body parts—a head region (cephalothorax) and an abdomen. Insects have six legs and three body parts—a head, thorax, and abdomen. Arachnids also lack wings and antennae. Arachnids comprise a very large and diverse group that includes spiders, ticks, scorpions, opilionids (harvestmen), mites, and the Solifugae (camel spiders).

Quick Facts


For more information on spiders in California we refer you to the University of California, Riverside, Spider Research page and to the University of California's Integrated Pest Management page.