Triangulate cobweb spider (Steatoda triangulosa)

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Triangulate cobweb spider - Wikipedia
Triangulate cobweb spider - U. of Nebraska-Lincoln

On May 14, 2014, I found this little spider hanging out in the corner of my bathroom. Triangulate cobweb spiders can have medically significant bites, but they are very reluctant to bite anyone. They have very poor sight, and depend on the movements of their webs to detect prey. They are a cosmopolitan species, and are generally found in people's homes.