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  1. Highlights

    • Four echinoderm body plans were established in the Early Paleozoic
    • Body-plan distinctiveness was amplified by extinction and confounded by convergence
    • Disparity increased through the Cambrian and plateaued in the Ordovician
    • Higher-order features could be altered through time, enabling later innovation
    www.sciencedirect.com/science/article/pii/S096098222030261X
    www.sciencedirect.com/science/article/pii/S096098222030261X
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