500-Million-Year Fossil Mystery Solved
Credit: Zhang Xiguang.
A recent study by scientists from Durham University and Yunnan University has led to a significant reclassification of a peculiar spiny fossil, initially believed to be one of the earliest molluscs.
This fossil, named Shishania aculeata, originates from 500-million-year-old Cambrian deposits in Yunnan Province, China. Previously thought to be an ancestor of modern snails, slugs, and clams due to its supposed mollusc-like features such as a muscular foot and mineralised spines, Shishania has now been identified as a distant relative of chancelloriids—sponge-like creatures with defensive spines.
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Source: https://www.ancientpages.com/2025/05/09/500-million-year-fossil-mystery-solved/
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