THE EARLY RADIATION AND PHYLOGENY OF ECHINODERMS

@article{Paul1984THEER,
  title={THE EARLY RADIATION AND PHYLOGENY OF ECHINODERMS},
  author={Christopher R. C. Paul and Andrew B.T. 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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