Enjoying our latest content?
Log in or create an account to continue
- Access the most recent journalism from Nature's award-winning team
- Explore the latest features & opinion covering groundbreaking research
or
Rights and permissions
About this article
Cite this article
JEFFERIES, R. Echinoderms and Chordates. Nature 220, 1007–1008 (1968). https://doi.org/10.1038/2201007b0
Issue date:
DOI: https://doi.org/10.1038/2201007b0
