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Yellow sac spider
Yellow sac spiders are Clubionids, a family of spiders that range in body length from 3 to 15 mm and build silken tubes under stones, in leaves, or in grass. Cheiracanthium inclusum, found throughout the United States, as well as in Mexico southward through South America, is venomous to humans and is often found indoors.
The spider’s venom is a cytotoxin that can produce necrotizing lesions, but such lesions occur rarely in bite victims. Still, redness and swelling at the site of the bite are common reactions. Yellow sac spiders are not docile creatures; a female yellow sac spider, for example may bite when defending her eggs.
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