The discovery of a 550 million-year-old sea sponge fossil reveals that non-biomineralizing sponges existed in the Precambrian.
A 540-million-year-old sea sponge fossil discovered five years ago along the Yangtze River in China has attracted the attention of scientists lately, leading them to analyze its disposition.
Sponges have been considered the most basal metazoan phylum – the earliest and simplest forms of animals that could hold vital clues to the origin of animals. “If this was true, they wouldn’t survive fossilization except under very special circumstances where rapid fossilization outcompeted degradation.”
“When searching for fossils of early sponges I had expected them to be very small,” commented Alex Liu, a collaborator from the University of Cambridge.
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