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Cranial Morphology and Variation of the Earliest Indonesian Hominids

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Asian Paleoanthropology

Abstract

The Early Pleistocene deposits of Sangiran, Central Java, have yielded the oldest hominid fossils in Indonesia. This Sangiran assemblage is the oldest sizable hominid fossil collection so far known from Asia, and along with the African and Georgian arrays is the best comparative collection of Early Pleistocene Homo in the world. For this reason, the Sangiran hominid materials are important for understanding the dispersal and paleobiology of earlier members of our genus. However, due to ambiguous contextual documentation and the fragmentary nature of many of the existing fossils, our understanding of the taxonomic affinities and morphological variation of the earliest Indonesian hominids remains unclear. In this paper, we review recent chronostratigraphic data, and examine the Sangiran cranial remains. Contrary to previous arguments that the oldest Indonesian hominids are characterized by cranial robusticity, we propose that these hominids are actually highly variable, including both robust and gracile morphotypes. In overall cranial size and shape, and dentognathic morphology, the earliest Indonesian hominids appear to be comparable to c. 1.7 Ma early Homo erectus from East Africa. Evolutionary and taxonomic implications of these findings are discussed.

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Notes

  1. 1.

    Wolpoff (1999) also defined two chronological groups of the Early Pleistocene Javanese hominin remains by setting a boundary at the top of the Grenzbank zone. However, he failed to find this temporal variation due to some errors in his stratigraphic allocation of the fossil specimens.

  2. 2.

    To be exact, whether Sangiran 4 was unearthed from the uppermost part of the Sangiran Formation or overlying Grenzbank zone is currently indeterminate (Matsu’ura 1982; Itihara et al. 1985).

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Acknowledgements

We would like to thank Christopher Bae and David Braun for inviting us to participate in this volume. We are grateful to Friedmann Schrenk, Ottmar Kullmer, John de Vos, and Yahdi Zaim for access to the specimens in their care. Donald E. Tyler kindly provided us a cast of Sangiran 31, Shuji Matsu’ura and three anonymous reviewers made helpful comments, and Christopher Bae and David Braun assisted us in correcting the English. We also thank Sudijono, Iyep Saefudin, Eko Edi Susanto, Selamet, Sutanto, Shuichiro Narasaki, Koeshardjono, and Rusyad Adi Surijanto for field participation and laboratory assistance. This work was supported by the Japan Society for the Promotion of Science, and National Museum of Nature and Science, Tokyo.

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Kaifu, Y., Indriati, E., Aziz, F., Kurniawan, I., Baba, H. (2011). Cranial Morphology and Variation of the Earliest Indonesian Hominids. In: Norton, C., Braun, D. (eds) Asian Paleoanthropology. Vertebrate Paleobiology and Paleoanthropology. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9094-2_11

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