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Science 28 October 1994:
Vol. 266. no. 5185, pp. 637 - 639
DOI: 10.1126/science.266.5185.637
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Articles

Middle Cambrian Arthropod Embryos with Blastomeres

Xi-guang Zhang 1 and Brian R. Pratt 1

1 Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada

A phosphatized Middle Cambrian (sim510 million years ago) fauna from Duyun, southern China, has yielded fossil embryos that may be of arthropod affinity and could belong to the co-occurring eodiscid trilobite Pagetia sp. The shell was most likely flexible and possessed at least two thin layers. Four embryos reveal blastomeres, and two embryonic stages are represented. These embryos demonstrate that the basic paradigm for the growth of the invertebrate embryo has not changed in more than half a billion years.

Submitted on June 7, 1994
Accepted on August 30, 1994


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