Helicocystis is a stalked, spiralling pentaradial echinoderm known from the Cambrian Jbel Wawrmast Formation.

References

  1. ^ Smith, A. B.; Zamora, S. (2013). "Cambrian spiral-plated echinoderms from Gondwana reveal the earliest pentaradial body plan". Proceedings of the Royal Society B: Biological Sciences. 280 (1765): 20131197. doi:10.1098/rspb.2013.1197. PMC 3712455. PMID 23804624.


Allikas: https://en.wikipedia.org/wiki/Helicocystis
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