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Orthocephalization in the postweaning squirrel monkey

H M Pucciarelli1, V Dressino

  • 1CIGEBA (Centro de Investigaciones en Genética Básica y Aplicada), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Buenos Aires, Argentina.

American Journal of Physical Anthropology
|October 1, 1996
PubMed
Summary
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Postweaning malnutrition in squirrel monkeys (Saimiri sciureus) affected skull size but not shape. This indicates that malnutrition impacts overall growth rather than the orthocephalization process.

Area of Science:

  • Primatology
  • Developmental Biology
  • Comparative Anatomy

Background:

  • Squirrel monkeys (Saimiri sciureus) exhibit cranial development patterns similar to rodents and apes.
  • Understanding primate skull development is crucial for evolutionary and comparative studies.

Purpose of the Study:

  • To investigate the effects of postweaning malnutrition on skull development and orthocephalization in squirrel monkeys.
  • To determine if malnutrition impacts skull shape changes during growth.

Main Methods:

  • Twenty male squirrel monkeys were divided into control and low-protein diet groups.
  • Lateral teleradiographs of skulls were analyzed for midsagittal chord lengths and angles.
  • Measurements were compared between age-matched control and malnourished groups.

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Main Results:

  • Age significantly influenced skull chord lengths (70%) and angles (50%).
  • Malnutrition arrested approximately 50% of skull chord length growth.
  • Skull shape, indicated by angles, was largely unaffected by malnutrition.

Conclusions:

  • Postweaning malnutrition in squirrel monkeys primarily affects skull size, not shape.
  • The orthocephalization process in Saimiri sciureus appears resilient to nutritional deficits.
  • Findings suggest that skull shape development follows a robust pattern independent of moderate malnutrition.