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Integrative and Comparative Biology Advance Access published online on June 6, 2007
Integrative and Comparative Biology, doi:10.1093/icb/icm040
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. All rights reserved. For permissions please email: journals.permissions@oxfordjournals.org.

Can we ever identify the Urmetazoan?

Bernd Schierwater1,*,{dagger} and Rob DeSalle{dagger}
*ITZ, Ecology & Evolution, TiHo Hannover, Bünteweg 17d, D-30559 Hannover, Germany; {dagger}American Museum of Natural History, Division of Invertebrate Zoology 79 St. at Central Park West, New York, NY 10024, USA

Correspondence: 1E-mail: bernd.schierwater{at}ecolevol.de

Unraveling the root of the metazoan tree of life has been a difficult task since the time of Haeckel and the invention of phylogenetics. Even considerable amounts of recent molecular data have not provided a generally accepted answer. Here, we review the major problems of this phylogenetic conundrum and provide some directions for solving it.

From the symposium "Key Transitions in Animal Evolution" presented at the annual meeting of Society of Integrative and Comparitive Biology, Phoenix, Arizona, January 3–7, 2007.


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