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Human evolution. Comment on "Human-like hand use in Australopithecus africanus".

Sergio Almécija1, Ian J Wallace2, Stefan Judex3

  • 1Department of Anatomical Sciences, Stony Brook University, Stony Brook, NY 11794, USA. Center for the Advanced Study of Human Paleobiology, Department of Anthropology, The George Washington University, Science and Engineering Hall, 800 22nd Street NW, Washington, DC 20052, USA. Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, Carrer de les Columnes s/n, Campus de la UAB, 08193 Cerdanyola del Vallès, Barcelona, Spain. sergio.almecija@gmail.com.

Science (New York, N.Y.)
|June 6, 2015
PubMed
Summary
This summary is machine-generated.

Australopithecus africanus may have possessed human-like dexterity for tool use 3 million years ago, according to bone structure analysis. However, this finding doesn't disprove earlier evidence suggesting manipulation skills predated systematic stone tool manufacture.

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Area of Science:

  • Paleoanthropology
  • Primatology
  • Skeletal Biology

Background:

  • The evolution of human dexterity and tool use is a key area of paleoanthropological research.
  • Previous studies have proposed timelines for the emergence of human-like manipulative abilities in early hominins.
  • The relationship between skeletal morphology and behavioral capabilities is crucial for understanding hominin evolution.

Purpose of the Study:

  • To evaluate the claim that Australopithecus africanus exhibited human-like dexterity for stone tool manufacture and use.
  • To critically assess the evolutionary and biological assumptions underlying the interpretation of metacarpal trabecular bone structure.
  • To determine if the proposed findings refute existing hypotheses on the precedence of manipulation skills over systematic tool manufacture.

Main Methods:

  • Analysis of metacarpal trabecular bone structure in Australopithecus africanus fossils.
  • Comparative analysis with extant primate and human skeletal data.
  • Review of existing fossil and archaeological evidence for early hominin behavior.

Main Results:

  • Skinner et al. suggested human-like dexterity in Australopithecus africanus based on bone structure, dating to 3 million years ago.
  • The study's evolutionary and biological assumptions were found to be potentially misinformed.
  • The findings did not successfully refute the hypothesis that human-like manipulation abilities emerged before systematic stone tool manufacture.

Conclusions:

  • The interpretation of metacarpal trabecular bone structure requires careful consideration of broader evolutionary contexts.
  • Evidence suggests that sophisticated manipulation skills may have predated the systematic production of stone tools.
  • Further research is needed to reconcile skeletal evidence with the archaeological record of early hominin behavior.