science518 millionDated at 518 million years old, it shows their common ancestor had active tentacles

518-million-year-old fossil reveals ancestor of starfish

A newly discovered fossil upends the evolutionary history of ambulacrarian animals like sea urchins and starfish.

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The fact

Dated at 518 million years old, it shows their common ancestor had active tentacles.

This finding challenges the hypothesis of passive feeding through gills.

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Auto-synthesis from 1 media source · identified on September 16, 2026