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Resolution of the Early Placental Mammal Radiation Using Bayesian Phylogenetics
Abstract
Molecular phylogenetic studies have resolved placental mammals into four major groups, but have not established the full hierarchy of interordinal relationships, including the position of the root. The latter is critical for understanding the early biogeographic history of placentals. We investigated placental phylogeny using Bayesian and maximum-likelihood methods and a 16.4-kilobase molecular data set. Interordinal relationships are almost entirely resolved. The basal split is between Afrotheria and other placentals, at about 103 million years, and may be accounted for by the separation of South America and Africa in the Cretaceous. Crown-group Eutheria may have their most recent common ancestry in the Southern Hemisphere (Gondwana).
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Supported by the NSF (M.S.S.), the Training and Mobility of Researchers (TMR) program of the European Commission (W.W.d.J. and M.J.S.), and the Conselho Nacional de Desenvolvimento Cientı́fico e Tecnológico (CNPq), Brazil (E.E.).
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Published In
Science
Volume 294 | Issue 5550
14 December 2001
14 December 2001
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Received: 17 October 2001
Accepted: 12 November 2001
Published in print: 14 December 2001
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