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).
- In California, the main spider capable of causing serious injury is the Black Widow
- The Brown Recluse Spider does NOT live in California
- There are very few spiders in California that are capable of causing injury via biting
- Overall, spiders are beneficial because they eat pestiferous and disease causing insects
- The hobo spider does not live in California and has never been documented in the state
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.