Morphological correlates of the first metacarpal proximal articular surface with manipulative capabilities in apes, humans and South African early hominins
| Autor: | Christina L. Nicholas, Damiano Marchi, Emma Huston, Florian Fischer, Daniel J. Proctor |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Gorilla Thumb 010603 evolutionary biology 01 natural sciences First metacarpal Paranthropus robustus 03 medical and health sciences biology.animal medicine Manipulation Australopithecus africanus Locomotion 3D geometric morphometrics Morphometrics biology General Engineering Anatomy Articular surface biology.organism_classification 030104 developmental biology medicine.anatomical_structure Homo erectus |
| Zdroj: | Comptes Rendus Palevol. 16:645-654 |
| ISSN: | 1631-0683 |
| Popis: | This study quantifies the metacarpal 1 (MC 1) proximal articular surface using three-dimensional morphometrics in extant hominids and fossil hominins (SK 84, cf. Paranthropus robustus/Homo erectus and StW 418, Australopithecus africanus ) to understand which characteristics of the proximal metacarpal 1 are potentially correlated with human manipulative abilities and if they can be used in a paleoanthropological setting. A principal components (PC) analysis was used to compare MC 1 proximal articular surface shape and ANOVA and Tukey's HSD post-hoc tests were conducted to determine differences among groups. Homo is significantly different from nonhuman hominids having a less radioulnarly and dorsovolarly curved articular surface. All nonhuman hominids have more curved articular surface with Gorilla showing the most curved joint. Moreover, this study highlights the presence of a radially extended surface in Homo that may be related to the greater thumb abduction in human manipulation activities. Both fossils analyzed show a great ape-like MC 1 proximal articular surface which, associated with recent trabecular and archaeological evidence, may indicate that the ability to make/use stone tools preceded the morphological adaptations associated today with such behavior. |
| Databáze: | OpenAIRE |
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