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The StW 573 Little Foot Fossil Should Not Be Attributed to Australopithecus prometheus.

Jesse M Martin1,2, Luca Morris-Obst2, A B Leece2

  • 1Leverhulme Centre for Human Evolutionary Studies, Department of Archaeology, University of Cambridge, Cambridge, UK.

American Journal of Biological Anthropology
|November 29, 2025
PubMed
Summary
This summary is machine-generated.

The Little Foot fossil (StW 573) does not belong to Australopithecus prometheus. Its distinct morphology differentiates it from both Australopithecus prometheus and Australopithecus africanus, suggesting a unique taxonomic position.

Keywords:
Australopithecus prometheusAustralopithecus africanusSterkfonteinhuman evolution

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Area of Science:

  • Paleoanthropology
  • Human Evolution
  • Fossil Analysis

Background:

  • The taxonomic classification of early hominin fossils is crucial for understanding human evolutionary history.
  • The StW 573 (Little Foot) specimen has been a subject of debate regarding its placement within the Australopithecus genus.

Purpose of the Study:

  • To test the hypothesis that the StW 573 fossil specimen should be taxonomically attributed to Australopithecus prometheus.
  • To clarify the phylogenetic relationships of StW 573 within the Australopithecus lineage.

Main Methods:

  • Comparative morphological analysis of the StW 573 fossil.
  • Utilized classic qualitative anatomical descriptions and comparisons.
  • Supplemented with examination of selected relevant quantitative measurements.
  • Compared StW 573 to the type specimen of A. prometheus (MLD 1) and consensus members of Australopithecus africanus.

Main Results:

  • StW 573 does not share a unique suite of primitive and derived traits with the A. prometheus type specimen (MLD 1).
  • Significant morphological differences were observed between StW 573 and MLD 1, including cranial features and capacity.
  • MLD 1 exhibits greater morphological similarity to consensus members of Australopithecus africanus (e.g., Sts 5, MLD 37/38).

Conclusions:

  • Australopithecus prometheus should remain a junior synonym for Australopithecus africanus due to demonstrated morphological similarities between MLD 1 and the broader A. africanus sample.
  • StW 573 cannot be attributed to Australopithecus prometheus.
  • StW 573 differs significantly from specimens conventionally attributed to Australopithecus africanus, indicating a potentially distinct taxonomic status.