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Home / Equine Research Bank / Elife / A new genus of horse from Pleistocene North America.
eLife2017; 6; e29944; doi: 10.7554/eLife.29944

A new genus of horse from Pleistocene North America.

Abstract: The extinct 'New World stilt-legged', or NWSL, equids constitute a perplexing group of Pleistocene horses endemic to North America. Their slender distal limb bones resemble those of Asiatic asses, such as the Persian onager. Previous palaeogenetic studies, however, have suggested a closer relationship to caballine horses than to Asiatic asses. Here, we report complete mitochondrial and partial nuclear genomes from NWSL equids from across their geographic range. Although multiple NWSL equid species have been named, our palaeogenomic and morphometric analyses support the idea that there was only a single species of middle to late Pleistocene NWSL equid, and demonstrate that it falls outside of crown group . We therefore propose a new genus, , for the sole species . Our combined genomic and phenomic approach to resolving the systematics of extinct megafauna will allow for an improved understanding of the full extent of the terminal Pleistocene extinction event.
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Publication Date: 2017-11-28 PubMed ID: 29182148PubMed Central: PMC5705217DOI: 10.7554/eLife.29944Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't
  • Research Support
  • N.I.H.
  • Extramural
  • Research Support
  • U.S. Gov't
  • Non-P.H.S.

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research examines the extinct ‘New World stilt-legged’, or NWSL, equids which are a group of Pleistocene horses that were endemic to North America. Through the use of complete mitochondrial and partial nuclear genomes, the study finds that these equids belonged to a single species that falls outside of previously known groups, leading to the proposal of a new genus.

Genomic Analysis of NWSL Equids

  • The research focused on the NWSL equids – Pleistocene horses native to North America, which have slender distal limb bones similar to those of Asiatic asses, like the Persian onager.
  • Earlier genetic studies suggested that these horses may be closely related to caballine horses rather than Asiatic asses.
  • The scientists obtained complete mitochondrial genomes and partial nuclear genomes from NWSL equid remains found in different location across North America.

Defining a New Genus

  • Even though there have been several species of NWSL equid named in the past, the genetic analysis performed in this study supports the hypothesis that all these equids belonged to a single species that existed between the middle and late Pleistocene epoch.
  • The genetics of this species show they do not fit within any previously known group (or “crown group”), suggesting that they belong to a newfound genus.
  • The researchers propose the name “Haringtonhippus francisci” for this new genus and sole species.

Implications For Understanding Pleistocene Extinction

  • By integrating genomic (genetic) and phenomic (physical traits) approaches, the study enables a refined system for classifying extinct megafauna (large animals).
  • This new understanding could allow for a more comprehensive comprehension of the full extent of the Pleistocene extinction event, which saw the disappearance of numerous large mammal species.

Cite This Article

APA
Heintzman PD, Zazula GD, MacPhee R, Scott E, Cahill JA, McHorse BK, Kapp JD, Stiller M, Wooller MJ, Orlando L, Southon J, Froese DG, Shapiro B. (2017). A new genus of horse from Pleistocene North America. Elife, 6, e29944. https://doi.org/10.7554/eLife.29944

Publication

eLife
ISSN: 2050-084X
NlmUniqueID: 101579614
Country: England
Language: English
Volume: 6
PII: e29944

Researcher Affiliations

Heintzman, Peter D
  • Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, United States.
  • Tromsø University Museum, UiT - The Arctic University of Norway, Tromsø, Norway.
Zazula, Grant D
  • Yukon Palaeontology Program, Government of Yukon, Whitehorse, Canada.
MacPhee, Ross DE
  • Department of Mammalogy, Division of Vertebrate Zoology, American Museum of Natural History, New York, United States.
Scott, Eric
  • Cogstone Resource Management, Incorporated, Riverside, United States.
  • California State University San Bernardino, San Bernardino, United States.
Cahill, James A
  • Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, United States.
McHorse, Brianna K
  • Department of Organismal and Evolutionary Biology, Harvard University, Cambridge, United States.
Kapp, Joshua D
  • Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, United States.
Stiller, Mathias
  • Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, United States.
  • Department of Translational Skin Cancer Research, German Consortium for Translational Cancer Research, Essen, Germany.
Wooller, Matthew J
  • College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, United States.
  • Alaska Stable Isotope Facility, Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, United States.
Orlando, Ludovic
  • Centre for GeoGenetics, Natural History Museum of Denmark, København K, Denmark.
  • Université Paul Sabatier, Université de Toulouse, Toulouse, France.
Southon, John
  • Keck-CCAMS Group, Earth System Science Department, University of California, Irvine, Irvine, United States.
Froese, Duane G
  • Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada.
Shapiro, Beth
  • Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, United States.
  • UCSC Genomics Institute, University of California, Santa Cruz, Santa Cruz, United States.

MeSH Terms

  • Animals
  • Biometry
  • DNA / chemistry
  • DNA / genetics
  • Fossils
  • Genotype
  • Horses / anatomy & histology
  • Horses / classification
  • Horses / genetics
  • North America
  • Phenotype
  • Sequence Analysis, DNA

Grant Funding

  • S10 RR027303 / NCRR NIH HHS
  • S10 RR029668 / NCRR NIH HHS

Conflict of Interest Statement

No competing interests declared.

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