Black widow spider

Photo of a black widow spider.

Source: U.S. National Park Service. Available online: http://www.nps.gov

Black widow spiders (Latrodectus mactans) are found throughout the United States. Female black widows are long-legged, shiny, coal-black spiders with an orange, red, or yellow hourglass shape on their underside. Female black widows are usually about 1.5 in. (3.8 cm) across but may be smaller.

Last Updated: January 26, 2010

Author: Jan Nissl, RN, BS

Medical Review: Martin Gabica, MD - Family Medicine & Sean P. Bush - Emergency Medicine, Envenomation Specialist & H. Michael O'Connor, MD - Emergency Medicine

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