Word: bryozoa
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Dates: during 1990-1999
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Even more speculative are scientists' attempts to address the flip side of the Cambrian mystery: why this evolutionary burst, so stunning in speed and scope, has never been equaled. With just one possible exception - the Bryozoa, whose first traces turn up shortly after the Cambrian - there is no record of new phyla emerging later on, not even in the wake of the mass extinction that occurred 250 million years ago, at the end of the Permian period...
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