Epiphyseal union and dental eruption Macaca mulatta

Area of Science:

• Primate biology
• Skeletal biology
• Forensic anthropology

Background:

• Accurate age estimation in non-human primates is crucial for biological and ecological studies.
• Rhesus macaques (Macaca mulatta) are a key model organism in biomedical research.
• Skeletal and dental development provide valuable indicators of age in juvenile animals.

Purpose of the Study:

• To establish age estimation methods for rhesus macaques using dental eruption and epiphyseal fusion.
• To investigate sex-specific differences in epiphyseal fusion timing.
• To determine the relationship between skeletal and dental development in aging rhesus macaques.

Main Methods:

• Analysis of 299 rhesus macaque skeletons with known age of death from the Cayo Santiago collection.
• Systematic recording of dental eruption status and epiphyseal fusion patterns.
• Multiple regression analyses to predict age from developmental markers.

Main Results:

• Established patterns and timing for dental eruption and epiphyseal fusion in rhesus macaques.
• Females demonstrate significantly earlier epiphyseal fusion than males, particularly at elbow and knee joints.
• Skeletal and dental development were found to be largely independent, with considerable variation in developmental state among individuals of the same chronological age.

Conclusions:

• Dental eruption and epiphyseal fusion provide reliable, albeit independent, methods for age estimation in juvenile rhesus macaques.
• Sex differences in fusion timing highlight the importance of considering sex in age assessment.
• The findings contribute to a better understanding of primate growth and development, with implications for research and conservation.