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Lost children of the Cambrian

The initial flowering of animal life on Earth occurred during the Cambrian, some 540–490 million years ago. Fossil embryos from that time can provide clues about the origins of the major animal groups.

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Figure 1: Adult representatives of the three living scalidophorans.
Figure 2: The place of Markuelia in evolution, as inferred from the new work5.


  1. Zhang, X.-G & Pratt, B. R. Science 266, 637–639 (1994).

    ADS  CAS  Article  PubMed  Google Scholar 

  2. Bengtson, S. & Yue, Z. Science 277, 1645–1648 (1997).

    Article  Google Scholar 

  3. Xiao, S., Yang, Z. & Knoll, A. H. Nature 391, 553–558 (1998).

    ADS  CAS  Article  Google Scholar 

  4. Conway Morris, S. BioEssays 20, 676–682 (1998).

    Article  Google Scholar 

  5. Dong, X.-p, Donoghue, P. C. J., Cheng, H. & Liu, J.-b Nature 427, 237–240 (2004).

    ADS  CAS  Article  PubMed  Google Scholar 

  6. Nielsen, C. Animal Evolution: Interrelationships of the Living Phyla 2nd edn (Oxford Univ. Press, 2001).

    Google Scholar 

  7. Aguinaldo, A. M. A. et al. Nature 387, 489–493 (1997).

    CAS  Article  Google Scholar 

  8. Budd, G. Nature 412, 487 (2001).

    ADS  CAS  Article  PubMed  Google Scholar 

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Budd, G. Lost children of the Cambrian. Nature 427, 205–207 (2004).

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