Spiders
Black Spider With Red Markings — Widow ID Guide
Includes the widow spiders you should know, plus common look-alikes that are harmless.
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Field notes
True widows (Latrodectus) have a glossy jet-black round body with a clear red hourglass under the abdomen. False widows (Steatoda) have a similar shape but no red hourglass and their bite is mild.
Related guides
Photos & species data via iNaturalist . Community-verified sightings from naturalists worldwide.