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Buried Deep in China, This Weird Ancient Sponge Closes a 160-Million-Year Gap in Evolution
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Buried Deep in China, This Weird Ancient Sponge Closes a 160-Million-Year Gap in Evolution
The find, led by Shuhai Xiao of Virginia Tech, suggests that the earliest sponges lacked mineral skeletons, which may explain why older fossils have remained elusive. Sponges are considered among the earliest animals to evolve, with molecular clock estimates placing their origin at around 700 million years ago. Yet, until now, convincing fossils extended back only to about 540 million years ago, creating a persistent discrepancy between genetic …
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