Entomology (Study of Bugs)/unidentified spider


Mystery red body
Mystery red body  
I ran into this spider in San Leandro, Northern California. The body was about an inch long. The body was definitely brown, not black. I saw it in a suburban neighborhood on October 25, around 11AM. It walked slowly alongside me, did not jump when I put me camera right in front of it. Can you identify the photo for me?

Hi, Debbie:

Thanks for including the nice image with your question.

The spider is an orbweaver in the genus Araneus , and probably Araneus andrewsi .  Here's more about it:


Note that this is a highly variable species in color and pattern.

Thank you again for sharing your discovery!  Have a great evening.



Entomology (Study of Bugs)

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Eric R. Eaton


I answer insect and spider identification questions ONLY. Attach images if possible. No "what bit me?", "what do I feed this bug in captivity?", or science fair project questions please. NO TECHNICAL QUESTIONS ABOUT INSECT PHYSIOLOGY.


Principal author, Kaufman Field Guide to Insects of North America. Professional entomologist employed previously at University of Massachusetts, Chase Studio, Inc., and Cincinnati Zoo; contract work for West Virginia Department of Natural Resources, Smithsonian Institution, and Portland (Oregon) State University.

Author, Kaufman Field Guide to Insects of North America, Missouri Conservationist magazine, Ranger Rick, Birds & Blooms, Timeline (journal of the Ohio Historical Society). I have contributed to several books as well.

Oregon State University, undergraduate major in entomology, did not receive degree.

Awards and Honors
One of the top 50 experts in all categories for AllExperts.com, 2009.

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Principal author of the Kaufman Field Guide to Insects of North America, Smithsonian Institution (contract), Cincinnati Zoo (employer), Portland State University (contract), Chase Studio, Inc (employer), Arkansas Museum of Discovery (guest speaker). Currently seeking speaking engagements, leadership roles at nature festivals, workshops, and ecotours.

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