Du pilastre et de la linea aspera et de leurs relations avec la bipédie permanente

Abstract : The presence of a pilaster and a linea aspera in Homo sapiens, which are absent in Pan and Gorilla, raises the question of the relevance of these features as indicators of obligate bipedalism in early hominin fossils. A further issue is the specific femoral diaphyseal flatness of early Homo compared with that of extant Homo. The results of our study on these questions indicate, firstly, that obligate bipedalism cannot be inferred with any certainty from the pilastric index. Secondly, the main factor that frequently influences the formation of a pilaster in the extant population is lacking. The wide variation in the pilastric index could be due to a combination of factors, but this does not preclude the predominant involvement of one specific factor in certain cases. Nevertheless, in Pan, Gorilla and Homo, the mean and high values of the pilastric indices appear to be significantly related to locomotor activities: in fact, as from a certain degree of pilastric development (>109), it is possible to determine obligate bipedalism in hominoids, with the exception of gibbons. Finally, it seems more appropriate to combine the pilastric index with the morphology of the linea aspera to offer a functional interpretation of the diaphysis of ancient hominins.
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Submitted on : Thursday, November 19, 2015 - 4:21:33 PM
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Tony Chevalier. Du pilastre et de la linea aspera et de leurs relations avec la bipédie permanente. Bulletins et Mémoires de la Société d'anthropologie de Paris, Springer Verlag, 2014, 26 (1-2), pp 34-51. ⟨10.1007/s13219-013-0084-8⟩. ⟨hal-01231194⟩

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