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Systematic Biology 2007 56(4):673-684; doi:10.1080/10635150701491149
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© 2007 Society of Systematic Biologists

The Adequacy of Morphology for Reconstructing the Early History of Placental Mammals

Edited by Ron DeBry: Associate Editor

Mark S. Springer1, Angela Burk-Herrick1, Robert Meredith1, Eduardo Eizirik2, Emma Teeling3, Stephen J. O'Brien4 and William J. Murphy5

1 Department of Biology, University of California Riverside, Riverside, CA, 92521, USA E-mail: mark.springer@ucr.edu (M.S.S.)
2 Faculdade de Biociencias, PUCRS Porto Allegre, RS, 90619-900, Brazil
3 School of Biological and Environmental Sciences, University College Dublin Belfield Dublin, 4, Ireland
4 Laboratory of Genomic Diversity, National Cancer Institute–Frederick Frederick, MD, 21702, USA
5 Department of Veterinary Integrative Biosciences, Texas A&M University College Station, TX, 77843-4458, USA

Received January 11, 2006; Revised June 6, 2006; Accepted May 2, 2007
The first 150 words of the full text of this article appear below.

Mammalian anatomists and paleontologists working primarily with osteological data have long been intrigued with the problem of eutherian diversification, including both interordinal relationships and the timing of the placental mammal radiation (McKenna, 1975; Novacek, 1992). Cladistic analyses of morphological characters for placental mammal orders have suggested a variety of superordinal hypotheses (Table 1). Molecular trees based on single gene segments were often in conflict with each other and with morphology, but larger nuclear gene data sets that include longer and/or multiple gene segments have converged on a well-supported superordinal tree topology that divides placental orders into four major groups: Afrotheria, Xenarthra, Laurasiatheria, and Euarchontoglires (Madsen et al., 2001; Murphy et al., 2001a, 2001b; Scally et al., 2001; Amrine-Madsen et al., 2003). Analyses of independent molecular and genomic data sets, specifically whole mitochondrial genomes and rare genomic changes (RGCs), are . . . [Full Text of this Article]


   Expanded Molecular Sampling
 

   Pseudoextinction Analyses
 

   Data Congruence
 

   Conclusions
 

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