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How Neanderthal molar teeth grew.

Roberto Macchiarelli1, Luca Bondioli, André Debénath

  • 1Laboratoire de Géobiologie, Biochronologie et Paléontologie Humaine, UMR 6046 CNRS, Université de Poitiers, 86022 Poitiers, France.

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Summary
This summary is machine-generated.

Neanderthal molar growth and development align with modern humans, but unique enamel-dentine junction morphology and root extension rates distinguish them. This study reveals key Neanderthal life history traits.

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Area of Science:

  • Paleoanthropology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Growth and development are crucial for understanding demographic structure and life history strategies.
  • Primate molar tooth development provides insights into life history evolution and birth timing.
  • Previous Neanderthal growth estimations relied on speculative anterior tooth surface data.

Purpose of the Study:

  • To investigate Neanderthal molar microstructure and developmental timing.
  • To compare Neanderthal life history variables with those of modern humans.
  • To refine understanding of Neanderthal growth and development patterns.

Main Methods:

  • High-resolution micro-computed tomography (micro-CT) for imaging complex tooth structures.
  • Analysis of internal molar microstructure, including enamel-dentine junction morphology.
  • Examination of tooth histology to determine birth timing and growth rates.

Main Results:

  • Neanderthal molar crown and root completion timing is comparable to modern humans.
  • Neanderthals exhibit a more complex enamel-dentine junction morphology.
  • A distinct late peak in Neanderthal molar root extension rate was observed.

Conclusions:

  • Neanderthal life history variables, particularly regarding molar development, fall within the range of modern humans.
  • Internal molar microstructure provides definitive data on Neanderthal growth, superseding previous anterior tooth-based predictions.
  • Subtle differences in molar development distinguish Neanderthals from modern humans, offering new insights into their life history.