Half-a-billion-year-old tiny predator unveils the rise of scorpions and spiders

Two palaeontologists working on the world-renowned Burgess Shale have revealed a new species, called Mollisonia plenovenatrix, which is presented as the oldest chelicerate. This discovery places the origin of this vast group of animals — of over 115,000 species, including horseshoe crabs, scorpions and spiders — to a time more than 500 million years ago.
Paleontology News — ScienceDaily

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