Hand and feet bones were recovered from the adult female specimen of Au. sediba, in particular an almost complete right hand and the right arm bones, as well as several bones from the left hand. Her thumb is small in length and breadth, but it has both homo and australopithecine features.
Scholars researching Au. sediba argue that MH2's long thumb and short fingers might be, theoretically anyway, associated with tool making. No stone tools were found with the fossils; but stone tools are known from the archaeological record dating to 2.6 million years ago. Up until now, these stone tools were believed to have been made by Homo habilis.
Sources
Berger LR, De Ruiter DJ, Churchill SE, Schmid P, Carlson KJ, Dirks PHGM, and Kibii JM. 2010. Australopithecus sediba: A New Species of Homo-Like Australopith from South Africa. Science 238:195-204.
Dirks PHGM, Kibii JM, Kuhn BF, Steininger C, Churchill SE, Kramers JD, Pickering R, Farber DL, Meriaux A-S, Herries AIR et al. . 2010. Geological Setting and Age of Australopithecus sediba from Southern Africa. Science 238 205-208.
Kivell TL, Kibii JM, Churchill SE, Schmid P, and Berger LR. 2011. Australopithecus sediba hand demonstrates mosaic evolution of locomotor and manipulative abilities. Science 333:1411-1417.
