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Hippotherium Datum implies Miocene palaeoecological pattern.

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Fossil discoveries in China reveal Hippotherium weihoense, a new species of ancient horse. This finding clarifies evolutionary paths and habitat preferences of early Late Miocene hipparion horses in Eurasia.

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Biogeography

Background:

  • The Linxia Basin in China is a key fossil site for understanding Eurasian paleontology.
  • The genus Hippotherium, a group of extinct horses, has a complex evolutionary history.
  • Previous classifications of Hippotherium species in China require re-evaluation.

Purpose of the Study:

  • To re-evaluate the taxonomy of Hippotherium species from the Linxia Basin.
  • To investigate the evolutionary routes and palaeoecology of Old World hipparion species during the early Late Miocene.
  • To understand the impact of geological events on hipparion diversification.

Main Methods:

  • Morphological comparison of fossil specimens (skulls and postcranial elements).
  • Phylogenetic analysis to determine evolutionary lineages.
  • Locomotive ability analysis to infer habitat preferences.

Main Results:

  • Hippotherium weihoense and Hippotherium chiai from China are identified as the same species, H. weihoense.
  • Two distinct evolutionary routes, the Hippotherium and Cormohipparion lineages, are identified for early Late Miocene hipparions.
  • Hippotherium weihoense inhabited open environments, while other Hippotherium species preferred closed habitats, reflecting palaeoecological patterns linked to Asian aridification.

Conclusions:

  • The study clarifies the taxonomy and evolutionary history of Hippotherium in East Asia.
  • Hipparion horses diversified rapidly, adapting to different niches in response to environmental changes.
  • Palaeoecological patterns in the early Late Miocene Eurasia were shaped by geological events and regional climate variations.