About the Authors

Ruggero D'Anastasio

r.danastasio@unich.it

Affiliation State University “G. d'Annunzio”, Department of Human Movement Sciences, Section of Anthropology, Chieti, Italy

Bernhard Zipfel

Affiliation University of the Witwatersrand, Bernard Price Institute for Palaeontological Research and Institute for Human Evolution, Johannesburg, South Africa

Jacopo Moggi-Cecchi

Affiliation University of Florence, Department of Evolutionary Biology, Laboratories of Anthropology, Florence, Italy

Roscoe Stanyon

Affiliation University of Florence, Department of Evolutionary Biology, Laboratories of Anthropology, Florence, Italy

Luigi Capasso

Affiliation State University “G. d'Annunzio”, Department of Human Movement Sciences, Section of Anthropology, Chieti, Italy

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RD LC. Performed the experiments: RD BZ JMC. Analyzed the data: RD BZ JMC RS LC. Contributed reagents/materials/analysis tools: RD. Wrote the paper: RD BZ. Acquired the data and the Scanning Electron Microscope analysis and contributed to the interpretation of data: RD. Described the anthropological characteristics of A. africanus Stw 431 and the main geological features of the paleontological site: BZ. Produced the mould of the vertebrae of Stw 431, contributed to the interpretation of data and to the writing of the article: JMC. Contributed to the interpretation of data and the writing of the article: RS LC.