Collective Behavior in an Early Cambrian Arthropod

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Science  10 Oct 2008:
Vol. 322, Issue 5899, pp. 224
DOI: 10.1126/science.1162794

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Examples that indicate collective behavior in the fossil record are rare. A group association of specimens that belong to a previously unknown arthropod from the Chengjiang Lagerst�tte, China, provides evidence that such behavior was present in the early Cambrian (about 525 million years ago), coincident with the earliest extensive diversification of the Metazoa, the so-called Cambrian explosion event. The chainlike form of these specimens is unique for any arthropod, fossil or living, and most likely represents behavior associated with migration.

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