This fossil is an Opabinia regalis (Walcott, 1912) which is an extinct arthropod. It was found by Charles Walcott (1850-1927) in 1912 in Burgess Shale of British Columbia Canada. It dates to the Middle Cambrian Period (505 million years ago).
The picture was taken in June 2023 on the first floor of the Smithsonian Museum of Natural History in Washington D.C. USA.
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