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Sea Urchins' All-Body Brain Redefines Nervous-System Evolution

11/8/2025

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Summary

Story summary

Researchers report that sea urchins possess an all-body brain, challenging prior views of their neural organization.
Biologist Jack Ullrich-Lüter led a study showing a vertebrate-like genetic structure in sea urchins.
The work focused on the purple sea urchin, Paracentrotus lividus, mapping cell types during metamorphosis.
The findings suggest the adult body is predominantly headlike and lacks a true trunk, reshaping ideas about nervous-system evolution.

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Story summary

Researchers report that sea urchins possess an all-body brain, challenging prior views of their neural organization.
Biologist Jack Ullrich-Lüter led a study showing a vertebrate-like genetic structure in sea urchins.
The work focused on the purple sea urchin, Paracentrotus lividus, mapping cell types during metamorphosis.
The findings suggest the adult body is predominantly headlike and lacks a true trunk, reshaping ideas about nervous-system evolution.