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Related Experiment Video

Updated: Jan 11, 2026

Sampling and Pretreatment of Tooth Enamel Carbonate for Stable Carbon and Oxygen Isotope Analysis
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Enamel Prism Angle Variation and Hard-Object Feeding in Cercopithecoids With Known Diets.

Jacob Scheinblum1, W Scott McGraw1, Kaita Gurian1

  • 1Department of Anthropology, The Ohio State University, Columbus, Ohio, USA.

American Journal of Biological Anthropology
|November 19, 2025
PubMed
Summary
This summary is machine-generated.

Primate enamel prism angles vary with diet hardness, with habitual hard-object feeders showing significantly higher angles than soft-object feeders. This relationship is complex, impacting inferences about fossil primate diets.

Keywords:
enamelenamel prismshard‐object feedingmasticationteeth

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Area of Science:

  • Primate paleontology
  • Dental microwear analysis
  • Evolutionary biology

Background:

  • Enamel prism orientation is crucial for tooth strength and wear resistance.
  • Dietary hardness influences selective pressures on dental microstructure.
  • Cercopithecoid primates exhibit diverse feeding strategies, from soft to hard objects.

Purpose of the Study:

  • To investigate the relationship between enamel prism angles and dietary hardness in three cercopithecoid genera.
  • To test if habitual hard-object feeders (durophagous) have higher prism angles than soft-object feeders.
  • To compare prism angles between habitually durophagous and fallback hard-object feeding species.

Main Methods:

  • Sectioning and microscopic imaging of primate molars.
  • Measuring enamel prism and wear angles using ImageJ FIJI software.
  • Statistical analysis (repeated measures regressions) to assess predictors of prism angle.

Main Results:

  • Genus and wear angle were significant predictors of enamel prism angle.
  • Cercocebus atys (habitual hard-object feeder) exhibited significantly higher prism angles than Lophocebus albigena and Cercopithecus.
  • No significant difference in prism angles was found between Lophocebus albigena (fallback hard-object feeder) and Cercopithecus (soft-object feeder).

Conclusions:

  • The enamel microstructure of fallback hard-object feeders is more similar to soft-object feeders than habitual hard-object feeders.
  • The link between durophagy and enamel microstructure is not straightforward.
  • Inferring durophagy in fossil primates based solely on enamel microstructure may be challenging.