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Nature 457, 1094-1095 (26 February 2009) | doi:10.1038/4571094a; Published online 25 February 2009
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Palaeontology: Birth of the jawed vertebrates
Per E. Ahlberg1
Abstract
The discovery of embryos in certain fossil fishes not only shows that internal fertilization and live birth evolved early in vertebrate history, but also raises questions about the origin of jawed vertebrates.
Every once in a while, a discovery comes along that puts our biological understanding of some extinct group of organisms on a much firmer footing. On page 1124 of this issue, Long and colleagues1 present such a discovery, one that may prove to have far-reaching implications for our understanding of early vertebrate evolution.
- Per E. Ahlberg is in the Subdepartment of Evolutionary Organismal Biology, Department of Physiology and Developmental Biology, Uppsala University, 752 36 Uppsala, Sweden.
Email: per.ahlberg@ebc.uu.se
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