Australia: The Land Where Time Began

A biography of the Australian continent 

Cambrian Explosion - Ctenophora

The comb rows of fossil ctenophores make them easy to identify, and they are known from Cambrian deposits of Stages 3 and 5 (J.Y. Chen, Schopf et al., 2007; Conway Morris & Collins, 1996). The fossil forms tend to have more comb rows than extant forms, though they are apparently always in multiples of 8, and 1 possible ctenophore form from the Burgess Shale has been estimated to have had 80 comb rows (Briggs, Erwin & Collier, 1994). The early radiation of ctenophore morphologies extends well beyond extant forms, and according to the authors1 none of the ctenophores that are known from the Cambrian would be classed within the crown group.

Sources & Further reading

  1. Erwin, Douglas H., & Valentine, James W., 2013, The Cambrian Explosion: The Construction of Animal Biodiversity, Roberts & Co., Greenwood Village, Colorado

 

Author: M. H. Monroe
Email:  admin@austhrutime.com
Last Updated 10/05/2014
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                                                                                           Author: M.H.Monroe  Email: admin@austhrutime.com     Sources & Further reading