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Spider Identification
- Know which species are venomous -
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Summary: Spider identification can be tricky. Fortunately very few species pose any real threat in terms of a venomous or poisonous bite. Learn which, if any, venomous species occur where you live and learn how to avoid them.
Jack DeAngelis, PhD
OSU Ext. Entomologist (ret.)
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 The spiders are an extremely large and diverse group with thousands of species and while most are harmless a few are dangerously venomous. Spider identification can be very tricky especially once you get below the level of the family classification. Species and genus-level determinations generally require a good stereomicroscope plus some experience. You may, however, be able to figure out higher level classification by comparing your specimen to a drawing or photograph.
What's important for most people is to be able to accurately identify the poisonous or venomous species that occur around where they live. In the US three species are commonly blamed for venomous bites: the hobo spider, the brown recluse spider and the black widow spider.
Once you learn to recognize and avoid the few venomous species where you live you can relax. For all other spiders you should use a field guide with good color pictures and range maps to do your identification (see Related Articles below for the venomous species found in North America).
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a harmless common garden spider
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Spider identification guide
Most experts agree that you'll need a microscope or hand lens and good reference materials to identify even common spiders. You should not rely on color patterns alone because these can be very confusing and not consistent from specimen to specimen.
A better approach is to identify particular characters in each species that distinguish it from other, similar species and a guidebook is the only way to do this accurately. There are many books for spider experts that have access to good microscopes and a lot of experience but How to Know the Spiders (Pictured Key Nature Series) is an in-depth and specific guide to spider identification that will be useful for non-experts as well.
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Control indoor spiders with sticky traps
The most dangerous indoor spider species can be effectively trapped with homemade and commercial spider traps. See Related Articles below for information about constructing sticky board traps for household spiders.
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Mission: To provide accurate, up-to-date and unbiased information for solving common insect and mite problems around your home, business and landscape using least-toxic methods.
Jack DeAngelis, Ph.D.
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