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Type: Journal article
Title: Evolution systematics and phylogeography of Pleistocene horses in the New World: a molecular perspective
Author: Weinstock, J.
Willerslev, E.
Sher, A.
Tong, W.
Ho, S.
Rubenstein, D.
Storer, J.
Burns, J.
Martin, L.
Bravi, C.
Prieto, A.
Froese, D.
Scott, E.
Xulong, L.
Cooper, A.
Citation: PLoS Biology, 2005; 3(8):e241
Publisher: Public Library of Science
Issue Date: 2005
ISSN: 1544-9173
Statement of
Jaco Weinstock, Eske Willerslev, Andrei Sher, Wenfei Tong, Simon Y.W. Ho, Dan Rubenstein, John Storer, James Burns, Larry Martin, Claudio Bravi, Alfredo Prieto, Duane Froese, Eric Scott, Lai Xulong, Alan Cooper
Abstract: The rich fossil record of horses has made them a classic example of evolutionary processes. However, while the overall picture of equid evolution is well known, the details are surprisingly poorly understood, especially for the later Pliocene and Pleistocene, c. 3 million to 0.01 million years (Ma) ago, and nowhere more so than in the Americas. There is no consensus on the number of equid species or even the number of lineages that existed in these continents. Likewise, the origin of the endemic South American genus Hippidion is unresolved, as is the phylogenetic position of the “stilt-legged” horses of North America. Using ancient DNA sequences, we show that, in contrast to current models based on morphology and a recent genetic study, Hippidion was phylogenetically close to the caballine (true) horses, with origins considerably more recent than the currently accepted date of c. 10 Ma. Furthermore, we show that stilt-legged horses, commonly regarded as Old World migrants related to the hemionid asses of Asia, were in fact an endemic North American lineage. Finally, our data suggest that there were fewer horse species in late Pleistocene North America than have been named on morphological grounds. Both caballine and stilt-legged lineages may each have comprised a single, wide-ranging species.
Keywords: Bone and Bones; Animals; Equidae; Horses; DNA, Mitochondrial; Sequence Analysis, DNA; Evolution, Molecular; Phylogeny; Base Sequence; Sequence Homology, Nucleic Acid; Fossils; Molecular Sequence Data; North America; South America
Rights: Copyright: © 2005 Weinstock et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 0020065895
DOI: 10.1371/journal.pbio.0030241
Appears in Collections:Earth and Environmental Sciences publications
Australian Centre for Ancient DNA publications
Environment Institute Leaders publications

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