THE EARLY RADIATION AND PHYLOGENY OF ECHINODERMS
@article{Paul1984THEER, title={THE EARLY RADIATION AND PHYLOGENY OF ECHINODERMS}, author={C. Paul and A. Smith}, journal={Biological Reviews}, year={1984}, volume={59} }
1. Living echinoderms are characterized by an extensive water vascular system developed from the larval left hydrocoel, a complex, multi‐plated endoskeleton with stereom structure, and pentamery. Fossil evidence shows that stereom evolved before pentamery, but both were acquired during the Lower Cambrian.
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