DDx
Differential Diagnoses
Media Gallery
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Black widow spider (Latrodectus mactans) and offspring. Photo by Sean Bush, MD.
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Female black widow spider guarding an egg case; species Latrodectus mactans. By Chuck Evans (mcevan). [CC BY 2.5 (https://creativecommons.org/licenses/by/2.5)], courtesy of Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Black_Widow_Spider_07-04-20.jpg).
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Female black widow spider, Latrodectus mactans, in the process of spinning her web on a tree branch. Note the characteristic red hourglass located on her inferior abdominal surface. This marking can vary in coloration from yellowish to shades of orange and red and, at times, white. The female’s body is an overall shiny jet-black in color. This spider was found on a farm in the US state of Georgia. By James Gathany (http://phil.cdc.gov/phil/) [Public domain], courtesy of Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Black_widow_spider_9854_lores.jpg).
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A redback spider (Latrodectus hasseltii) female, found in suburban Sydney, New South Wales, Australia. By Toby Hudson [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], courtesy of Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Latrodectus_hasseltii_close.jpg).
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Young female Latrodectus tredecimguttatus; photo taken in Croatia by K. Korlevic. No machine-readable author provided. Kork~commonswiki assumed (based on copyright claims). [Public domain], via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Latrodectus_tredecimguttatus_female.jpg).
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