The three-banded panther worm is rewriting the story of brain evolution
The animal has a brain structure all its own, according to a 2026 preprint. The finding hints that brains could have evolved centralization before regionalization.
A 2026 preprint reveals that the three-banded panther worm, a marine creature with a brain structure unlike any other, may challenge long-held assumptions about the evolution of brain organization. This unique worm, lacking specialized regions in its nervous system, has a condensed concentration of nerve cells in its head, yet it can regrow its entire body from a fragment.
Researchers have observed that when parts of the worm's brain are removed, it still manages to hunt shrimp effectively, sometimes even when 80 percent of its head is missing. These findings suggest that brains might have evolved to centralize before regionalizing. The worm's lineage diverged from that of other bilaterally symmetrical organisms about 550 million years ago, near the base of the bilaterian family tree.
Researchers hope that further studies on this worm's nervous system will shed light on the evolution of complex brains.
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