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The Spine of Early Pleistocene Homo

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Spinal Evolution

Abstract

In this chapter, we summarize vertebral remains from early Pleistocene Homo, including H. erectus, as well as H. naledi and H. floresiensis fossils from the Middle and Late Pleistocene, respectively. Two partial immature H. erectus skeletons where vertebrae are well represented are KNM-WT 15000 (“Turkana boy”) and the D2700 individual from Dmanisi. Vertebrae from H. naledi are also considered here, including those from the LES1 partial skeleton (“Neo”), despite their younger date to the Middle Pleistocene. We review the fossil record of presacral vertebrae in early Homo, and summarize work on the functional morphology, metameric patterning, and postcranial neuroanatomy of early Homo, comparing and contrasting the presacral spine with their putative australopith forbears and extant apes and humans. Based on the current evidence, the vertebral column of H. erectus possessed a modal number of twelve thoracic and five lumbar segments, as is the case in australopiths, as well as modern humans. The spine of H. erectus reveals key changes relative to earlier hominins, with an expanded thoracolumbar spinal canal offering increased neurovascular capacities, and a ventral pillar (formed by the vertebral bodies) better equipped to mitigate compressive loads and provide energy return. These biological developments are germane to understanding the advent of derived human behaviors, including efficient long-range locomotion and the first hominin expansion out of Africa.

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Acknowledgements

The authors would like to thank Ella Been and Asier Gómez for taking the lead in organizing this volume and for their dedicated editorial assistance. We would also like to express our gratitude to two anonymous reviewers for their superb insights in improving an earlier draft of this chapter.

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Authors and Affiliations

  1. Department of Anthropology, Chaffey College, Rancho Cucamonga, CA, USA

    Marc R. Meyer

  2. Department of Anthropology, Centre for the Study of Human Origins, New York University, New York, NY, USA

    Scott A. Williams

  3. New York Consortium in Evolutionary Primatology, New York, NY, USA

    Scott A. Williams

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Correspondence to Marc R. Meyer .

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Editors and Affiliations

  1. Department of Sports Therapy, Department of Anatomy and Anthropology, Faculty of Health Professions, Ono Academic College, Sackler Faculty of Medicine, Kiryat Ono, Tel Aviv, Israel

    Ella Been

  2. Departmento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), IKERBASQUE, Basque Foundation for Science, Bilbao, Spain, Centro Mixto UCM-ISCIII de Evolución y, Comportamiento Humanos Avda. Monforte de Lemos, Leioa, Madrid, Spain

    Asier Gómez-Olivencia

  3. Departments of Anthropology and Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA

    Patricia Ann Kramer

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Meyer, M.R., Williams, S.A. (2019). The Spine of Early Pleistocene Homo. In: Been, E., Gómez-Olivencia, A., Ann Kramer, P. (eds) Spinal Evolution. Springer, Cham. https://doi.org/10.1007/978-3-030-19349-2_8

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