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Evolution, systematics and phylogeography of pleistocene horses in the new world: a molecular perspective

By 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 and Alan Cooper


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.<br/><br/>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.<br/><br/

Topics: CC, QH
Year: 2005
OAI identifier:
Provided by: e-Prints Soton

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  1. (1989). A quantitative study of North American fossil species of the genus Equus. In:
  2. (1990). Altweltliche Faunenelemente im Spa ¨tpleistoza ¨n Alaskas und die fru ¨he Besiedlungsgeschichte Nordamerikas. In:
  3. (2000). Ancient DNA: Do it right or not at all.
  4. (1973). Clulow FV
  5. (1998). Comments on Pleistocene horses from Tarija, Bolivia, and the validity of the genus Onohippidium (Mammalia: Equidae),
  6. (2003). Distribution patterns of postmortem damage in human mitochondrial DNA.
  7. (1979). Diversification and biogeography of the one-toed horses Onohippidium and Hippidion. Yale Peabody Mus Nat Hist Postilla 175:
  8. (1996). Early to Middle Pleistocene equids from Beringida.
  9. (1992). El registro de Hippidion Owen, 1869 y Equus (Amerhippus) Hoffstetter,
  10. (1970). Equus francisci Hay, a small stilt-legged horse. Middle Pleistocene of Texas.
  11. (2002). Estimating mutation parameters, population history and genealogy simultaneously from temporally spaced sequence data.
  12. (2001). Hippidion saldiasi Roth, 1899 (Equidae, Perissodactyla), at the Piedra Museo Site (Santa Cruz, Argentina): Its implication for the regional economy and environmental reconstruction.
  13. (1986). Identification and discrimination of metapodials from Pleistocene and modern Equus, wild and domestic.
  14. (1982). Karchoud A
  15. (1985). Late Cenozoic mammal dispersals between the Americas. In:
  16. (2003). Morphological convergence in Hippidion saldiasi and Equus (Amerhippus) Southern-American equids elucidated by ancient DNA analysis.
  17. (2001). MRBAYES: Bayesian inference of phylogenetic trees.
  18. (1992). Origins, dispersals, and migrations of Equus
  19. (2001). Paleobehavior in Alaskan Pleistocene horses: Social structure, maturation rates, uses of the landscape, and mortality patterns. In: Gerlach SC,
  20. (2002). PAUP*, version 4.0 [computer program]. Sunderland (Massachusetts): Sinauer Associates.
  21. (1978). Phylogeny of American horses of Blancan and Pleistocene age.
  22. (1997). Pleistocene horses from Tarija, Bolivia, and the PLoS Biology |
  23. (1980). Pleistocene mammals from Lost Chicken Creek,
  24. (1980). Pleistocene mammals of North America.
  25. (2000). Prieto A
  26. (2003). Rambaut A
  27. (2003). Rapid body size decline in Alaskan Pleistocene horses before extinction.
  28. (1993). Review of the genus Hippidion Owen, 1869 (Mammalia: Perissodactyla) from the Pleistocene of South America.
  29. (2001). Statistical evidence for miscoding lesions in ancient DNA templates.
  30. (1974). The empire of Equus.
  31. (1998). The genus Equus in North America.
  32. (2004). Tracer, version 1.1 [computer program].
  33. (2001). Widespread origins of domestic horse lineages.

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