Characterizing the body morphology of the first metacarpal in the Homininae using 3D geometric morphometrics

Primer Autor
Puschel, Thomas A.
Co-autores
Morley, Jonathan
Bucchi, Ana
Lorenzo, Carlos
Título
Characterizing the body morphology of the first metacarpal in the Homininae using 3D geometric morphometrics
Editorial
WILEY
Revista
AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY
Lenguaje
en
Resumen
Objectives The morphological characteristics of the thumb are of particular interest due to its fundamental role in enhanced manipulation. Despite its possible importance regarding this issue, the body of the first metacarcapal (MC1) has not been fully characterized using morphometrics. This could provide further insights into its anatomy, as well as its relationship with manipulative capabilities. Hence, this study quantifies the shape of the MC1's body in the extant Homininae and some fossil hominins to provide a better characterization of its morphology. Materials and methods The sample includes MC1s of modern humans (n = 42), gorillas (n = 27), and chimpanzees (n = 30), as well as Homo neanderthalensis, Homo naledi, and Australopithecus sediba. 3D geometric morphometrics were used to quantify the shape of MC1's body. Results The results show a clear distinction among the three extant genera. H. neanderthalensis mostly falls within the modern human range of variation. H. naledi varies slightly from modern humans, although also showing some unique trait combination, whereas A. sediba varies to an even greater extent. When classified using a discriminant analysis, the three fossils are categorized within the Homo group. Conclusion The modern human MC1 is characterized by a distinct suite of traits, not present to the same extent in the great apes, that are consistent with an ability to use forceful precision grip. This morphology was also found to align very closely with that of H. neanderthalensis. H. naledi shows a number of human-like adaptations, while A. sediba presents a mix of both derived and more primitive traits.
Tipo de Recurso
artículo original
doi
10.1002/ajpa.24473
Formato Recurso
PDF
Palabras Claves
3D geometric morphometrics
African apes
hominins
MC1
semi-landmarks
MODERN HUMAN HAND
AUSTRALOPITHECUS-SEDIBA
ARTICULAR SURFACE
EVOLUTION
THUMB
HUMANS
BIOMECHANICS
PROPORTIONS
LOCOMOTOR
ANATOMY
Ubicación del archivo
http://dx.doi.org/10.1002/ajpa.24473
Categoría OCDE
Antropología
Biología evolucionaria
Materias
Morfometría geométrica 3D
Simios africanos
homininos
MC1
semi-hitos
MANO HUMANA MODERNA
AUSTRALOPITHECUS-SEDIBA
SUPERFICIE ARTICULAR
EVOLUCIÓN
PULGAR
HUMANOS
BIOMECÁNICA
PROPORCIONES
LOCOMOTOR
ANATOMÍA
Título de la cita (Recomendado-único)
Characterizing the body morphology of the first metacarpal in the Homininae using 3D geometric morphometrics
Página de inicio (Recomendado-único)
748
Página final (Recomendado-único)
759
Identificador del recurso (Mandatado-único)
artículo original
Versión del recurso (Recomendado-único)
version publicada
Derechos de acceso
metadata
Access Rights
metadata
Identificador relacionado
https://www.biorxiv.org/content/10.1101/2020.04.30.070326v2.full.pdf
Id de Web of Science
WOS:000772246100012
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