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Temporal labyrinths of eastern Eurasian Pleistocene humans.

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Eastern Eurasian Homo semicircular canals show variation, with one specimen exhibiting Neandertal-like traits. This finding challenges the use of isolated features for population studies and highlights the complexity of archaic human diversity.

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Area of Science:

  • Paleoanthropology
  • Human Evolution
  • Osteology

Background:

  • Western Eurasian Neandertals possess distinct semicircular canal morphology (small anterior, large lateral, inferior posterior canals).
  • Previous analyses lacked comprehensive paleontological data from eastern Eurasian Pleistocene hominins.
  • Understanding this variation is crucial for assessing trait evolution within the genus Homo.

Purpose of the Study:

  • To analyze the temporal labyrinths of four eastern Eurasian Pleistocene Homo specimens.
  • To provide a broader context for evaluating trait polarities in Pleistocene Homo.
  • To investigate the significance of semicircular canal morphology in hominin population affinities.

Main Methods:

  • Morphological analysis of temporal labyrinths from Early (Lantian 1), Middle (Hexian 1), and Late (Xujiayao 15) Pleistocene archaic humans from eastern Eurasia.
  • Comparison with an early modern human (Liujiang 1) and known western Eurasian Neandertal data.
  • Assessment of semicircular canal relative sizes and positions.

Main Results:

  • Lantian 1, Hexian 1, and Liujiang 1 labyrinths align with modern human proportions, supporting the modern human pattern as ancestral for Homo.
  • The Xujiayao 15 labyrinth exhibits proportions intermediate to Neandertal variation, distinct from other eastern Eurasian samples.
  • This eastern Eurasian dichotomy in labyrinthine morphology is not associated with other Neandertal-like cranial features.

Conclusions:

  • The study reveals a dichotomy in eastern Eurasian Homo labyrinthine morphology, with Xujiayao 15 showing unique Neandertal-like traits.
  • This finding questions the reliability of single 'Neandertal' features for determining population affinities.
  • Further research is needed on cranial and postcranial correlates of Homo labyrinthine variation and late archaic human diversity across Eurasia.