Hallucigenia
Hallucigenia fossils have been found in the Burgess Shale deposits in southeastern British Columbia in Canada.
Hallucigenia was one of the earliest life forms in the earth's prehistoric ocean.
The exact period of the Halluceigenia's extinction isn't known, but they probably didn't survive past the Cambrian-Ordovician extinction event, which occurred approximately 488 million years ago.
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