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A segmented little beastie that swam Earth's seas nearly half a billion years ago has now been identified as the grandparent of spiders, scorpions, and horseshoe crabs., a teeny tiny creature around 5 millimeters long, and it thrived in an ocean that once covered what is now Morocco, 478 million years ago.
"Initially, we only intended to describe and name this fossil. We had absolutely no idea that it would hold so many secrets,""It was therefore an exhilarating surprise to realize, after careful observations and analysis, that it also filled an important gap in the evolutionary tree of life."This group contains spiders, scorpions, horseshoe crabs, mites, and ticks, as well as several extinct groups, such as sea scorpions.
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