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Drimolen cranium DNH 155 documents microevolution in an early hominin species
journal contributionposted on 09.12.2020, 22:18 by Jess Martin, Angeline Leece, Simon Neubauer, Stephanie E Baker, Carrie S Mongle, Giovanni Boschian, Gary T Schwartz, Amanda L Smith, Justin A Ledogar, David S Strait, Andrew Herries
Paranthropus robustus is a small-brained extinct hominin from South Africa characterized by derived, robust craniodental morphology. The most complete known skull of this species is DNH 7 from Drimolen Main Quarry, which differs from P. robustus specimens recovered elsewhere in ways attributed to sexual dimorphism. Here, we describe a new fossil specimen from Drimolen Main Quarry, dated from approximately 2.04-1.95 million years ago, that challenges this view. DNH 155 is a well-preserved adult male cranium that shares with DNH 7 a suite of primitive and derived features unlike those seen in adult P. robustus specimens from other chronologically younger deposits. This refutes existing hypotheses linking sexual dimorphism, ontogeny and social behaviour within this taxon, and clarifies hypotheses concerning hominin phylogeny. We document small-scale morphological changes in P. robustus associated with ecological change within a short time frame and restricted geography. This represents the most highly resolved evidence yet of microevolutionary change within an early hominin species.
This research was funded and supported by Higher Degree Research fee waivers and living scholarships from La Trobe University to J.M.M. and A.B.L. and an Australian Research Council Discovery Grant no. DP170100056 to A.I.R.H. and D.S.S. Biomechanical analysis was supported by a grant to D.S.S. from the Biological Anthropology Directorate of the National Science Foundation (no. NSF-BCS-0725126). S.N. was supported by the Max Planck Society.
- School of Humanities and Social Sciences