https://bsky.app/profile/apsciencebydan.bsky.social/post/3lcmdnjbx422m
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Chalcoscirtus diminutus is a species of jumping spider in the family Salticidae. It is found in the United States.
Wikipedia has more photos. Apparently it has no common name.
I had a jumping spider sit on the tip of my finger once for several minutes spinning out a thread of webbing that made it look like they were doing Kung fu moves.