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Science 25 May 2001:
Vol. 292. no. 5521, pp. 1496 - 1497
DOI: 10.1126/science.1061106
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Perspectives

PALEONTOLOGY:
Digging Up Fresh Clues About the Origin of Mammals

André Wyss

Whereas evolutionary biologists studying mammals have the advantage of being able to analyze living specimens of the three mammalian subgroups (monotremes, marsupials, and placentals), paleontologists interested in mammalian ancestors have had to make do with limited fragments of fossil skeletons. As Wyss explains in his Perspective, the finding of a beautifully preserved mammaliaform fossil in China, called Hadrocodium, is set to change our views about the morphological features that characterize modern-day mammals and their ancient ancestors.

The author is in the Department of Geological Sciences, University of California, Santa Barbara, CA 93106, USA. E-mail: wyss{at}geology.ucsb.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Phages and the Evolution of Bacterial Pathogens: from Genomic Rearrangements to Lysogenic Conversion.
H. Brussow, C. Canchaya, and W.-D. Hardt (2004)
Microbiol. Mol. Biol. Rev. 68, 560-602
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Science. ISSN 0036-8075 (print), 1095-9203 (online)