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The foot of Homo floresiensis

Abstract

Homo floresiensis is an endemic hominin species that occupied Liang Bua, a limestone cave on Flores in eastern Indonesia, during the Late Pleistocene epoch1,2. The skeleton of the type specimen (LB1) of H. floresiensis includes a relatively complete left foot and parts of the right foot3. These feet provide insights into the evolution of bipedalism and, together with the rest of the skeleton, have implications for hominin dispersal events into Asia. Here we show that LB1’s foot is exceptionally long relative to the femur and tibia, proportions never before documented in hominins but seen in some African apes. Although the metatarsal robusticity sequence is human-like and the hallux is fully adducted, other intrinsic proportions and pedal features are more ape-like. The postcranial anatomy of H. floresiensis is that of a biped1,2,3, but the unique lower-limb proportions and surprising combination of derived and primitive pedal morphologies suggest kinematic and biomechanical differences from modern human gait. Therefore, LB1 offers the most complete glimpse of a bipedal hominin foot that lacks the full suite of derived features characteristic of modern humans and whose mosaic design may be primitive for the genus Homo. These new findings raise the possibility that the ancestor of H. floresiensis was not Homo erectus but instead some other, more primitive, hominin whose dispersal into southeast Asia is still undocumented.

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Figure 1: The foot and long bones of the type specimen of H. floresiensis.
Figure 2: Intrinsic foot proportions in H. floresiensis.
Figure 3: The comparative anatomy and morphometrics of the navicular bone in H. floresiensis.
Figure 4: The comparative anatomy of the cuboid bone in H. floresiensis.

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Acknowledgements

This work was supported by grants from the Australian Research Council, the National Geographic Society, the Wenner-Gren Foundation for Anthropological Research, the Wellcome Trust and the Leakey Foundation. We also thank our colleagues Jatmiko, E. Wahyu Saptomo and T. Djubiantono for their encouragement and assistance in the excavations.

Author Contributions W.L.J., W.E.H.H.-S., R.E.W., M.W.T., M.J.M. and S.G.L. undertook the analyses of the pedal remains and wrote the paper; T.S. and R.A.D. were responsible for the Liang Bua excavations and assisted with data collection and analyses.

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Correspondence to W. L. Jungers.

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Jungers, W., Harcourt-Smith, W., Wunderlich, R. et al. The foot of Homo floresiensis. Nature 459, 81–84 (2009). https://doi.org/10.1038/nature07989

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