Allometry and interspecific differences in the facial cranium of two closely related macaque species

Anatomy Research International
Tsuyoshi ItoMasanaru Takai

Abstract

Interpreting evolutionary history of macaque monkeys from fossil evidence is difficult, because their evolutionary fluctuations in body size might have removed or formed important morphological features differently in each lineage. We employed geometric morphometrics to explore allometric trajectories of craniofacial shape in two closely related species, Macaca fascicularis and M. fuscata. These two species exhibit a single shared allometric trajectory in superoinferior deflection of the anterior face, indicating that the differences in this feature can be explained by size variation. In contrast, two parallel trajectories are demonstrated in craniofacial protrusion, indicating that even if they are comparable in size, M. fuscata has a higher and shorter face than M. fascicularis. The degree of facial protrusion is most likely a critical feature for phyletic evaluation in the fascicularis group. Such analyses in various macaques would help to resolve controversies regarding phyletic interpretations of fossil macaques.

References

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Nov 21, 2000·Molecular Phylogenetics and Evolution·Anthony J TosiD J Melnick
Apr 24, 2002·Journal of Human Evolution·Michelle Singleton
Mar 26, 2003·Journal of Morphology·Ruliang PanMing Li
Aug 5, 2003·Evolution; International Journal of Organic Evolution·Anthony J TosiD J Melnick
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Feb 27, 2010·American Journal of Physical Anthropology·John G FleagleAndrea L Baden

Citations

Jan 23, 2014·American Journal of Physical Anthropology·Tsuyoshi ItoMasanaru Takai
Mar 25, 2016·American Journal of Physical Anthropology·Lauren N Butaric, Scott D Maddux
Aug 31, 2019·Primates; Journal of Primatology·Takeshi NishimuraTsuyoshi Ito
Nov 28, 2017·American Journal of Physical Anthropology·Jacinda R LarsonBenedikt Hallgrimsson

Related Concepts

Face
Macaca fascicularis
Macaca mulatta
Evaluation
Structure of Habenulopeduncular Tract
Shapes
Size
Analysis
Orientation (spatial)
Species

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