A Nearly Complete Foot from Dikika, Ethiopia and its Implications for the Ontogeny and Function of Australopithecus Afarensis

Authors

Jeremy DeSilva, Dartmouth CollegeFollow
Corey M. Gill, Boston UniversityFollow
Thomas C. Prang, New York University
Miriam A. Bredella, Harvard Medical SchoolFollow
Zeresenay Alemseged, University of ChicagoFollow

Document Type

Article

Publication Date

7-4-2018

Publication Title

Science Advances

Abstract

The functional and evolutionary implications of primitive retentions in early hominin feet have been under debate since the discovery of Australopithecus afarensis. Ontogeny can provide insight into adult phenotypes, but juvenile early hominin foot fossils are exceptionally rare. We analyze a nearly complete, 3.32-million-year-old juvenile foot of A. afarensis (DIK-1-1f). We show that juvenile A. afarensis individuals already had many of the bipedal features found in adult specimens. However, they also had medial cuneiform traits associated with increased hallucal mobility and a more gracile calcaneal tuber, which is unexpected on the basis of known adult morphologies. Selection for traits functionally associated with juvenile pedal grasping may provide a new perspective on their retention in the more terrestrial adult A. afarensis.

DOI

10.1126/sciadv.aar7723

Comments

Open access fee supported by the Dartmouth Open Access Publishing fund.

Dartmouth Digital Commons Citation

DeSilva, Jeremy; Gill, Corey M.; Prang, Thomas C.; Bredella, Miriam A.; and Alemseged, Zeresenay, "A Nearly Complete Foot from Dikika, Ethiopia and its Implications for the Ontogeny and Function of Australopithecus Afarensis" (2018). Dartmouth Scholarship. 3490.
https://digitalcommons.dartmouth.edu/facoa/3490