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Platyrrhine dental eruption sequences.

Emily Henderson1

  • 1Department of Anthropology, University of Oregon, Eugene, OR 97405, USA. ehender1@uoregon.edu

American Journal of Physical Anthropology
|June 29, 2007
PubMed
Summary
This summary is machine-generated.

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Dental eruption patterns in New World monkeys (platyrrhines) vary significantly. Early molar eruption, observed in some species, may indicate primitive primate dental schedules and support evolutionary hypotheses.

Area of Science:

  • Primate Paleontology
  • Comparative Dental Anatomy
  • New World Monkey Evolution

Background:

  • Dental eruption sequences are crucial for understanding primate life history and evolution.
  • Previous research has established general patterns, but platyrrhine-specific sequences require detailed investigation.

Purpose of the Study:

  • To systematically document and compare dental eruption sequences across all 16 genera of extant platyrrhines.
  • To investigate the relationship between dental eruption timing and factors like diet, body mass, and phylogeny.

Main Methods:

  • Analysis of 367 juvenile platyrrhine mandibles and maxillae, scoring for permanent tooth presence and eruption stages.
  • Comparison of eruption timings relative to anterior dentition and deciduous tooth replacement.

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Main Results:

  • Significant variability in molar eruption timing was observed among platyrrhine genera.
  • Some genera, like Aotus, exhibit precocious molar eruption, while others, like Cebus and Callitrichines, show delayed eruption.
  • Eruption patterns align with Schultz's Rule and support phylogenetic hypotheses, with early molar eruption potentially indicating a primitive primate trait.

Conclusions:

  • Platyrrhine dental eruption sequences are diverse and offer insights into their evolutionary history.
  • Early molar eruption in certain taxa, including the fossil Branisella boliviana, supports the hypothesis of this being a primitive primate dental schedule.