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Purple Sea Urchins Redefine Brain Evolution with Unique Nervous System

11/16/2025

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Summary

Story summary

Researchers led by Periklis Paganos of Stazione Zoologica Anton Dohrn report that purple sea urchins have an all-body brain, with neurons forming an integrated system throughout the body.
The study, published in Science Advances, shows metamorphosis from bilateral larval symmetry to radial adult symmetry, yielding diverse neuronal cell types.
The findings indicate non-centralized nervous systems can exhibit brain-like organization, potentially altering our understanding of nervous system evolution.

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Story summary

Researchers led by Periklis Paganos of Stazione Zoologica Anton Dohrn report that purple sea urchins have an all-body brain, with neurons forming an integrated system throughout the body.
The study, published in Science Advances, shows metamorphosis from bilateral larval symmetry to radial adult symmetry, yielding diverse neuronal cell types.
The findings indicate non-centralized nervous systems can exhibit brain-like organization, potentially altering our understanding of nervous system evolution.