A 500-million-year-old fossil has been discovered, revealing new information about the origins of mollusks.

The fossil belongs to a newly identified species called Shishania aculeata, an ancient spiny slug. These early mollusks were flat, armored creatures covered in cone-shaped spines, rather than shells. The well-preserved fossils show a complex secretion system, similar to that of annelids (such as earthworms).

This discovery provides valuable insights into the evolutionary history of mollusks and their ancient adaptations. Explore the details of this find and how it contributes to our understanding of life's evolution.

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