The position of Australopithecus sediba within fossil hominin hand use diversity

Christopher J. Dunmore*, Matthew M. Skinner, Ameline Bardo, Lee R. Berger, Jean Jacques Hublin, Dieter H. Pahr, Antonio Rosas, Nicholas B. Stephens, Tracy L. Kivell

*Corresponding author for this work

Research output: Journal article (peer-reviewed)Journal article

37 Citations (Scopus)

Abstract

The human lineage is marked by a transition in hand use, from locomotion towards increasingly dexterous manipulation, concomitant with bipedalism. The forceful precision grips used by modern humans probably evolved in the context of tool manufacture and use, but when and how many times hominin hands became principally manipulative remains unresolved. We analyse metacarpal trabecular and cortical bone, which provide insight into behaviour during an individual’s life, to demonstrate previously unrecognized diversity in hominin hand use. The metacarpals of the palm in Australopithecus sediba have trabecular morphology most like orangutans and consistent with locomotor power-grasping with the fingers, while that of the thumb is consistent with human-like manipulation. This internal morphology is the first record of behaviour consistent with a hominin that used its hand for both arboreal locomotion and human-like manipulation. This hand use is distinct from other fossil hominins in this study, including A. afarensis and A. africanus.

Original languageEnglish
Pages (from-to)911-918
Number of pages8
JournalNature Ecology and Evolution
Volume4
Issue number7
DOIs
Publication statusPublished - 01 Jul 2020
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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