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Single Nerve Cord Revealed asA study analyzing Cambrian fossils uncovered that the ancestral ecdysozoan likely had a single ventral nerve cord, challenging long-standing views about the evolution of these structures. Fossil impressions from early Scalidophora species reveal similarities to modern priapulid nerve cords, supporting the single-cord hypothesis. This finding suggests that paired nerve cords in arthropods, kinorhynchs, and loriciferans evolved independently, linked to body segmentation and movement complexity.
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