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Rib cage anatomy in Homo erectus suggests a recent evolutionary origin of modern human body shape

Nature Ecology & Evolution volume 4, pages 1178–1187 (2020)Cite this article

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Abstract

The tall and narrow body shape of anatomically modern humans (Homo sapiens) evolved via changes in the thorax, pelvis and limbs. It is debated, however, whether these modifications first evolved together in African Homo erectus, or whether H. erectus had a more primitive body shape that was distinct from both the more ape-like Australopithecus species and H. sapiens. Here we present the first quantitative three-dimensional reconstruction of the thorax of the juvenile H. erectus skeleton, KNM-WT 15000, from Nariokotome, Kenya, along with its estimated adult rib cage, for comparison with H. sapiens and the Kebara 2 Neanderthal. Our three-dimensional reconstruction demonstrates a short, mediolaterally wide and anteroposteriorly deep thorax in KNM-WT 15000 that differs considerably from the much shallower thorax of H. sapiens, pointing to a recent evolutionary origin of fully modern human body shape. The large respiratory capacity of KNM-WT 15000 is compatible with the relatively stocky, more primitive, body shape of H. erectus.

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Fig. 1: Virtual quantitative 3D reconstruction of the KNM-WT 15000 thorax.
Fig. 2: PCA of thoracic vertebral shape.
Fig. 3: PCA of rib shape.
Fig. 4: PCA of thorax 3D shapes of fossil hominins and modern humans.
Fig. 5: Scatter plots of maximum widths, depths and heights of KNM-WT 15000 (actual and estimated adult) H. erectus compared to juvenile and adult modern humans and Kebara 2 Neanderthal.
Fig. 6: Functional simulation of respiratory kinematics.

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Data availability

Computed tomography scans of fossil material from the KNM-WT 15000 skeleton and the 3D models derived from them are the property of the National Museums of Kenya, to whom application must be made for access. The CT data for modern human thoraces cannot be shared, for ethical and legal reasons related to the protocols of the hospitals and hosting institutions. Interested readers should contact the authors, who will assist in getting in touch with the relevant institutions. All other data and linear measurements of fossil reconstructions are provided within the manuscript and Supplementary information.

References

  1. Walker, A. & Leakey, R. in The Nariokotome Homo erectus Skeleton (eds Walker, A. & Leakey, R.) 95–160 (Harvard Univ. Press, 1993).

  2. Ruff, C. & Walker, A. in The Nariokotome Homo erectus Skeleton (eds Walker, A. & Leakey, R.) 234–265 (Harvard Univ. Press, 1993).

  3. Jellema, L. M., Latimer, B. & Walker, A. in The Nariokotome Homo erectus Skeleton (eds Walker, A. & Leakey, R.) 294–325 (Harvard Univ. Press, 1993).

  4. Holliday, T. W. Body size, body shape, and the circumscription of the genus Homo. Curr. Anthropol. 53, S330–S345 (2012).

    Google Scholar 

  5. Antón, S. C., Leonard, W. R. & Robertson, M. L. An ecomorphological model of the initial hominid dispersal from Africa. J. Hum. Evol. 43, 773–785 (2002).

    PubMed  Google Scholar 

  6. Bramble, D. M. & Lieberman, D. E. Endurance running and the evolution of Homo. Nature 432, 345–352 (2004).

    CAS  PubMed  Google Scholar 

  7. Pontzer, H. Economy and endurance in human evolution. Curr. Biol. 27, R613–R621 (2017).

    CAS  PubMed  Google Scholar 

  8. Carrier, D. R. et al. The energetic paradox of human running and hominid evolution [and Comments and Reply]. Curr. Anthropol. 25, 483–495 (1984).

    Google Scholar 

  9. Lordkipanidze, D. et al. Postcranial evidence from early Homo from Dmanisi, Georgia. Nature 449, 305–310 (2007).

    CAS  PubMed  Google Scholar 

  10. Braun, D. R. et al. Oldowan behavior and raw material transport: perspectives from the Kanjera Formation. J. Archaeol. Sci. 35, 2329–2345 (2008).

    Google Scholar 

  11. Arsuaga, J. L. et al. A complete human pelvis from the middle Pleistocene of Spain. Nature 399, 255–258 (1999).

    CAS  PubMed  Google Scholar 

  12. Simpson, S. W. et al. A female Homo erectus pelvis from Gona, Ethiopia. Science 322, 1089–1092 (2008).

    CAS  PubMed  Google Scholar 

  13. Rosenberg, K. R., Zuné, L. & Ruff, C. B. Body size, body proportions, and encephalization in a Middle Pleistocene archaic human from northern China. Proc. Natl Acad. Sci. USA 103, 3552–3556 (2006).

    CAS  PubMed  Google Scholar 

  14. Bonmatí, A. et al. Middle Pleistocene lower back and pelvis from an aged human individual from the Sima de los Huesos site, Spain. Proc. Natl Acad. Sci. USA 107, 18386–18391 (2010).

    PubMed  Google Scholar 

  15. Arsuaga, J. L. et al. Postcranial morphology of the Middle Pleistocene humans from Sima de los Huesos, Spain. Proc. Natl Acad. Sci. USA 112, 11524–11529 (2015).

    CAS  PubMed  Google Scholar 

  16. Franciscus, R. G. & Churchill, S. E. The costal skeleton of Shanidar 3 and a reappraisal of Neandertal thoracic morphology. J. Hum. Evol. 42, 303–356 (2002).

    PubMed  Google Scholar 

  17. Gómez-Olivencia, A., Eaves-Johnson, K. L., Franciscus, R. G., Carretero, J. M. & Arsuaga, J. L. Kebara 2: new insights regarding the most complete Neandertal thorax. J. Hum. Evol. 57, 75–90 (2009).

    PubMed  Google Scholar 

  18. Gómez-Olivencia, A. et al. 3D virtual reconstruction of the Kebara 2 Neandertal thorax. Nat. Comm. 9, 4387 (2018).

    Google Scholar 

  19. Ohman, J. C. et al. Stature at death of KNM-WT 15000. J. Hum. Evol. 17, 129–142 (2002).

    Google Scholar 

  20. Graves, R. R., Lupo, A. C., McCarthy, R. C., Wescott, D. J. & Cunningham, D. L. Just how strapping was KNM-WT 15000? J. Hum. Evol. 59, 542–554 (2010).

    PubMed  Google Scholar 

  21. Ruff, C. B. & Burgess, M. L. How much more would KNM-WT 15000 have grown? J. Hum. Evol. 80, 74–82 (2015).

    PubMed  Google Scholar 

  22. Antón, S., Potts, R. & Aiello, L. Human evolution. Evolution of early Homo: an integrated biological perspective. Science 345, 1236828 (2014).

    PubMed  Google Scholar 

  23. Torres-Tamayo, N. et al. The torso integration hypothesis revisited in Homo sapiens: contributions to the understanding of hominin body shape evolution. Am. J. Phys. Anthropol. 167, 777–790 (2018).

    PubMed  Google Scholar 

  24. Williams, S. A. et al. The vertebrae and ribs of Homo naledi. J. Hum. Evol. 104, 136–154 (2017).

    PubMed  Google Scholar 

  25. Latimer, B., Lovejoy, C. O., Spurlock, L. & Haile-Selassie, Y. in The Postcranial Anatomy of Australopithecus afarensis: New Insights from KSD-VP-1/1 (eds Haile-Selassie, Y. & Su, D. F.) 143–153 (Springer, 2016).

  26. Schmid, P. et al. Mosaic morphology in the thorax of Australopithecus sediba. Science 340, 1234598 (2013).

    PubMed  Google Scholar 

  27. Bastir, M. et al. 3D geometric morphometrics of thorax variation and allometry in Hominoidea. J. Hum. Evol. 113, 10–23 (2017).

    PubMed  Google Scholar 

  28. De Troyer, A., Kirkwood, P. A. & Wilson, T. A. Respiratory action of the intercostal muscles. Phys. Rev. 85, 717–756 (2005).

    Google Scholar 

  29. García-Martínez, D. et al. Over 100 years of Krapina: new insights into the Neanderthal thorax from the study of rib cross-sectional morphology. J. Hum. Evol. 122, 124–132 (2018).

    PubMed  Google Scholar 

  30. Openshaw, P., Edwards, S. & Helms, P. Changes in rib cage geometry during childhood. Thorax 39, 624–627 (1984).

    CAS  PubMed  PubMed Central  Google Scholar 

  31. LoMauro, A. & Aliverti, A. Sex differences in respiratory function. Breathe 14, 131–140 (2018).

    PubMed  PubMed Central  Google Scholar 

  32. Bastir, M. et al. In vivo 3D analysis of thoracic kinematics: changes in size and shape during breathing and their implications for respiratory function in recent humans and fossil hominins. Anat. Rec. 300, 255–264 (2017).

    Google Scholar 

  33. Callison, W. É., Holowka, N. B. & Lieberman, D. E. Thoracic adaptations for ventilation during locomotion in humans and other mammals. J. Exp. Biol. 222, jeb189357 (2019).

    PubMed  Google Scholar 

  34. Latimer, B. & Ward, C. V. in The Nariokotome Homo erectus Skeleton (eds Walker, A. & Leakey, R.) 266–293 (Harvard Univ. Press, 1993).

  35. Haeusler, M., Schiess, R. & Boeni, T. New vertebral and rib material point to modern bauplan of the Nariokotome Homo erectus skeleton. J. Hum. Evol. 61, 575–582 (2011).

    PubMed  Google Scholar 

  36. Bastir, M. et al. Differential growth and development of the upper and lower human thorax. PLoS ONE 8, e75128 (2013).

    CAS  PubMed  PubMed Central  Google Scholar 

  37. Haeusler, M. et al. Morphology, pathology, and the vertebral posture of the La Chapelle-aux-Saints Neandertal. Proc. Natl Acad. Sci. USA 116, 4923–4927 (2019).

    CAS  PubMed  Google Scholar 

  38. Schiess, R. & Haeusler, M. No skeletal dysplasia in the Nariokotome boy KNM-WT 15000 (Homo erectus)—a reassessment of congenital pathologies of the vertebral column. Am. J. Phys. Anthropol. 150, 365–374 (2013).

    PubMed  Google Scholar 

  39. Warrener, A. G., Lewton, K. L., Pontzer, H. & Lieberman, D. E. A wider pelvis does not increase locomotor cost in humans, with implications for the evolution of childbirth. PLoS ONE 10, e0118903 (2015).

    PubMed  PubMed Central  Google Scholar 

  40. Beyer, B. et al. In vivo thorax 3D modelling from costovertebral joint complex kinematics. Clin. Biomech. 29, 434–438 (2014).

    Google Scholar 

  41. Beyer, B. et al. Effect of anatomical landmark perturbation on mean helical axis parameters of in vivo upper costovertebral joints. J. Biomech. 48, 534–538 (2015).

    PubMed  Google Scholar 

  42. De Troyer, A., Kelly, S., Macklem, P. T. & Zin, W. A. Mechanics of intercostal space and actions of external and internal intercostal muscles. J. Clin. Invest. 75, 850–857 (1985).

    PubMed  PubMed Central  Google Scholar 

  43. Wilson, T. A. & De Troyer, A. The two mechanisms of intercostal muscle action on the lung. J. Appl Physiol. 96, 483–488 (2004).

    PubMed  Google Scholar 

  44. Gehr, P. et al. Design of the mammalian respiratory system. V. Scaling morphometric pulmonary diffusing capacity to body mass: wild and domestic mammals. Respir. Physiol. 44, 61–86 (1981).

    CAS  PubMed  Google Scholar 

  45. Stahl, W. R. Scaling of respiratory variables in mammals. J. Appl. Physiol. 22, 453–460 (1967).

    CAS  PubMed  Google Scholar 

  46. Jones, R. L. & Nzekwu, M. M. U. The effects of body mass index on lung volumes. Chest 130, 827–833 (2006).

    PubMed  Google Scholar 

  47. Ruff, C. Body size and body shape in early hominins – implications of the Gona Pelvis. J. Hum. Evol. 58, 166–178 (2010).

    PubMed  Google Scholar 

  48. Ruff, C. B., Burgess, M. L., Squyres, N., Junno, J. A. & Trinkaus, E. Lower limb articular scaling and body mass estimation in Pliocene and Pleistocene hominins. J. Hum. Evol. 115, 85–111 (2018).

    PubMed  Google Scholar 

  49. Raichlen, D. A., Armstrong, H. & Lieberman, D. E. Calcaneus length determines running economy: implications for endurance running performance in modern humans and Neandertals. J. Hum. Evol. 60, 299–308 (2011).

    PubMed  Google Scholar 

  50. Schmidt-Nielsen, K. Desert Animals: Physiological Problems of Heat and Water (Clarendon Press, 1964)

  51. Hora, M., Pontzer, H., Wall-Scheffler, C. M. & Sládek, V. Dehydration and persistence hunting in Homo erectus. J. Hum. Evol. 138, 102682 (2020).

    PubMed  Google Scholar 

  52. Stewart, J. R. et al. Palaeoecological and genetic evidence for Neanderthal power locomotion as an adaptation to a woodland environment. Quat. Sci. Rev. 217, 310–315 (2019).

    Google Scholar 

  53. Ahmetov, I. I., Egorova, E. S., Gabdrakhmanova, L. J. & Fedotovskaya, O. N. Genes and athletic performance: an update. Genet. Sports 61, 41–54 (2016).

    Google Scholar 

  54. García-Martínez, D. et al. Ribcage measurements indicate greater lung capacity in Neanderthals and Lower Pleistocene hominins compared to modern humans. Commun. Biol. 1, 117 (2018).

    PubMed  PubMed Central  Google Scholar 

  55. Churchill, S. E. in Neanderthals Revisited (eds Harvati, K. & Harrison, T.) 113–156 (Springer Verlag, 2006).

  56. Churchill, S. E. Thin on the Ground: Neandertal Biology, Archeology and Ecology (Wiley Blackwell, 2014).

  57. Lieberman, D. E., Bramble, D. M., Raichlen, D. A. & Shea, J. J. in The First Humans: Origin and Early Evolution of the Genus Homo (eds Grine, F. E. et al.) 77–92 (Springer, 2009).

  58. García-Martínez, D., Riesco, A. & Bastir, M. in Geometric Morphometrics Trends in Biology, Paleobiology and Archaeology (eds Carme Rissech, L. L. et al.) 93–97 (Seminari d’Estudis i Recerques Preshistoriques, Universitat de Barcelona, Societat Catalana d’Arqueologia, 2018).

  59. Mitteroecker, P. & Gunz, P. Advances in geometric morphometrics. J. Evol. Biol. 36, 235–247 (2009).

    Google Scholar 

  60. Gunz, P. & Mitteroecker, P. Semilandmarks: a method for quantifying curves and surfaces. Hystrix 24, 103–109 (2013).

    Google Scholar 

  61. García-Martínez, D. et al. 3D growth changes in ribs during late ontogeny in hominids and its importance for the thorax of KNM-WT 15000: a preliminary approach. Proc. Eur. Soc. Study Hum. Evol. 6, 72 (2017).

    Google Scholar 

  62. Bastir, M., García-Martínez, D., Spoor, F. & Williams, S. A. Thoracic vertebral morphology of KNM-WT 15000. Proc. Eur. Soc. Study Hum. Evol. 8, 11 (2018).

    Google Scholar 

  63. Bastir, M. et al. Workflows in a virtual morphology lab: 3D scanning, measuring, and printing. J. Anthropol. Sci. 97, 1–28 (2019).

    Google Scholar 

  64. Mallison, H. The digital Plateosaurus II: an assessment of the range of motion of the limbs and vertebral column and of previous reconstructions using a digital skeletal mount. Acta Paleontol. Pol. 55, 433–458 (2010).

    Google Scholar 

  65. Been, E., Gómez-Olivencia, A., Kramer, P. A. & Barash, A. in Human Paleontology and Prehistory (eds Marom, A. & Hovers, E.) 239–251 (Springer Verlag, 2017).

  66. Bastir, M. et al. in The Human Spine (eds Been, E., Gómez-Olivencia, A. & Kramer, P.) 361–386 (Springer Verlag, 2019).

  67. Fletcher, J., Stringer, M., Briggs, C., Davies, T. & Woodley, S. CT morphometry of adult thoracic intervertebral discs. Eur. Spine J. 24, 2321–2329 (2015).

    PubMed  Google Scholar 

  68. Goh, S., Price, R. I., Leedman, P. J. & Singer, K. P. The relative influence of vertebral body and intervertebral disc shape on thoracic kyphosis. Clin. Biomech. 14, 439–448 (1999).

    CAS  Google Scholar 

  69. Schiess, R., Boeni, T., Rühli, F. & Haeusler, M. Revisiting scoliosis in the KNM-WT 15000 Homo erectus skeleton. J. Hum. Evol. 67, 48–59 (2014).

    PubMed  Google Scholar 

  70. Goodyear, M. D. E., Krleza-Jeric, K. & Lemmens, T. The Declaration of Helsinki. BMJ 335, 624–625 (2007).

    PubMed  PubMed Central  Google Scholar 

  71. Sokal, R. R. & Rohlf, F. J. Biometry 3rd edn (W. H. Freeman and Company, 1998).

  72. Hackx, M. et al. Effect of total lung capacity, gender and height on CT airway measurements. Br. J. Radiol. 90, 20160898 (2017).

    PubMed  PubMed Central  Google Scholar 

  73. Stocks, J. & Quanjer, P. Reference values for residual volume, functional residual capacity and total lung capacity. ATS Workshop on Lung Volume Measurements. Official Statement of The European Respiratory Society. Eur. Resp. J. 8, 492–506 (1995).

    CAS  Google Scholar 

  74. Nagesh, K. R. & Pradeep Kumar, G. Estimation of stature from vertebral column length in South Indians. Leg. Med. 8, 269–272 (2006).

    CAS  Google Scholar 

  75. Sverzellati, N. et al. Computed tomography measurement of rib cage morphometry in emphysema. PLoS ONE 8, e68546 (2013).

    CAS  PubMed  PubMed Central  Google Scholar 

  76. Cassart, M., Gevenois, P. A. & Estenne, M. Rib cage dimensions in hyperinflated patients with severe chronic obstructive pulmonary disease. Am. J. Respir. 154, 800–805 (1996).

    CAS  Google Scholar 

  77. García-Martínez, D. et al. 3D analysis of sexual dimorphism in ribcage kinematics of modern humans. Am. J. Phys. Anthropol. 169, 348–355 (2019).

    PubMed  Google Scholar 

  78. Beyer, B., Van Sint Jan, S., Chèze, L., Sholukha, V. & Feipel, V. Relationship between costovertebral joint kinematics and lung volume in supine humans. Respir. Physiol. Neurobiol. 232, 57–65 (2016).

    PubMed  Google Scholar 

  79. Chapman, T. et al. How different are the Kebara 2 ribs to modern humans? J. Anthropol. Sci. 95, 183–201 (2017).

    PubMed  Google Scholar 

  80. Van Sint, J. S. et al. Une plate-forme technologique liée à la paralysie cérébrale. Le projet ICT4Rehab. Med Sci. (Paris) 29, 529–536 (2013).

    Google Scholar 

  81. Hammer, Ø. PAST: Palaeontological Statistics, version 3.25 https://folk.uio.no/ohammer/past/past3manual.pdf (2019).

  82. Klingenberg, C. P. & Marugán-Lobón, J. Evolutionary covariation in geometric morphometric data: analyzing integration, modularity and allometry in a phylogenetic context. Syst. Biol. 62, 591–610 (2013).

    PubMed  Google Scholar 

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Acknowledgements

We thank the National Museums of Kenya, E. Mbua and F. Kyalo Manthi for permissions to perform CT and surface scanning of the vertebrae and ribs of KNM-WT 15000. H. Pontzer, D. Lieberman and B. Wood provided helpful comments on an earlier draft of this manuscript. We also thank B. Perea-Pérez, D.A. Cáceres-Monllor, A.L. Santos, E. Cunha and M. Almeida for permissions and access to their collections. This research was funded by the Spanish Ministry of Economy and Competitivity (no. CGL 2015-63648-P) to M.B. D.G.-M. was funded by IdEx University of Bordeaux Investments for the Future programme (no. ANR-10-IDEX-03-02) and the European Commission’s Research Infrastructure Action via the Synthesys Projects (nos. SE-TAF-6406, DE-TAF-6404, BE-TAF-5639). Financial support for M.H. was provided by the Swiss National Science Foundation (no. 31003A_176319/1) and the Mäxi Foundation. A.G.-O. received support from the Spanish FEDER/Ministerio de Ciencia e Innovación-AEI (project no. PGC2018-093925-B-C33) and Research Group (no. IT1418-19) from Eusko Jaurlaritza-Gobierno Vasco. A.G.-O. is funded by a Ramón y Cajal fellowship (no. RYC-2017-22558).

Author information

Author notes

  1. These authors contributed equally: Markus Bastir, Daniel García-Martínez.

Authors and Affiliations

  1. Departamento de Paleobiología, Museo Nacional de Ciencias Naturales, Madrid, Spain

    Markus Bastir, Daniel García-Martínez, Nicole Torres-Tamayo, Carlos A. Palancar & Alberto Riesco-López

  2. Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain

    Daniel García-Martínez

  3. Laboratory of Functional Anatomy, Université Libre de Bruxelles, Brussels, Belgium

    Benoît Beyer

  4. Faculty of Medicine, Bar-Ilan University, Safed, Israel

    Alon Barash

  5. Laboratory of Advanced Imaging and 3D Modelling, Section of Forensic Pathology, Department of Forensic Medicine, University of Copenhagen, Copenhagen, Denmark

    Chiara Villa

  6. Grupo de Investigación Giaval. Department of Anatomy and Human Embryology, Faculty of Medicine, University of Valencia, Valencia, Spain

    Juan Alberto Sanchis-Gimeno

  7. Department of Human Anatomy and Physiology, Faculty of Health Sciences, University of Johannesburg, Gauteng, South Africa

    Shahed Nalla

  8. Biomedical Research Institute, Hospital Universitario La Paz, Madrid, Spain

    Isabel Torres-Sánchez & Francisco García-Río

  9. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias, Madrid, Spain

    Francisco García-Río

  10. Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel

    Ella Been

  11. Department of Sports Therapy, Faculty of Health Professions, Ono Academic College, Kiryat Ono, Israel

    Ella Been

  12. Dept. Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Leioa, Spain

    Asier Gómez-Olivencia

  13. Sociedad de Ciencias Aranzadi, Donostia-San Sebastián, Spain

    Asier Gómez-Olivencia

  14. Centro UCM-ISCIII de Investigación sobre Evolución y Comportamiento Humanos, Madrid, Spain

    Asier Gómez-Olivencia

  15. Institute of Evolutionary Medicine, University of Zurich, Zurich, Switzerland

    Martin Haeusler

  16. Center for the Study of Human Origins, Department of Anthropology, New York University, New York , NY, USA

    Scott A. Williams

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

    Scott A. Williams

  18. Centre for Human Evolution Research, Department of Earth Sciences, The Natural History Museum, London, UK

    Fred Spoor

  19. Department of Human Evolution, MPI-EVA, Leipzig, Germany

    Fred Spoor

  20. Department of Anthropology, UCL, London, UK

    Fred Spoor

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  1. Markus Bastir
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Contributions

M.B., D.G.-M., S.A.W., N.T.-T. and F.G.-R. wrote the paper. D.G.-M., F.S., A.B., C.V., J.A.S.-G., I.T.-S., B.B., F.G.-R., M.H. and S.N. contributed data. M.B., D.G.-M., N.T.-T., C.A.P., A.R.-L., B.B., E.B. and A.G.-O. analysed data. All authors critically interpreted results. M.B. designed the project.

Corresponding author

Correspondence to Markus Bastir.

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Extended data

Extended Data Fig. 1 Original scans of the KNM-WT 15000 thoracic vertebrae and virtual 3D models and the reconstructed thoracic spine.

a, S (T1), b,T (T2), c, U (T3), d, CA (T4), e, T5: virtual, quantitative virtual 3D reconstruction, f, W, (T6), g, V (T7), h, T8: quantitative virtual 3D reconstruction. i, BI, (T9 quantitative virtual 3D reconstruction), j, X (T10, quantitative virtual 3D reconstruction), k, Y (T11), l, T12: virtually assembled following Haeusler et al.35; m: ventral view of thoracic spine, n: left lateral view of thoracic spine.

Extended Data Fig. 2 Original scans of the KNM-WT 15000 ribs and virtual 3D models for the rib cage reconstruction.

Cranial view of the individual ribs using the level assessment from Haeusler et al.35. The labels displayed in black are originals whereas the labels displayed in red colour are mirror images. (Rec indicates virtual reconstruction).

Extended Data Fig. 3 Mean comparisons of the juvenile and hypothetical adult KNM-WT 15000 thorax with modern humans and the Kebara 2 Neanderthal.

a, The KNM-WT 15000 thorax (red) superimposed on the modern human juvenile mean in Procrustes registration. b, The hypothetical adult KNM-WT 15000 thorax (red) superimposed on the modern human adult mean in Procrustes registration. c, The hypothetical adult KNM-WT 15000 thorax (red) superimposed on the Kebara 2 Neanderthal thorax reconstruction in Procrustes registration. Note the similar (more horizontal) orientation of the ribs in these two specimens due to reduced rib torsion.

Extended Data Fig. 4 Landmarks and semilandmarks of the ribs and thoracic vertebrae.

a, Rib landmarks account for height, thickness and the 3D shape of the cranial and caudal curvatures and torsion of the shaft. b, Vertebral landmarks account for the morphology of the vertebral body (outline of endplates, body height, width and lengths), and the neural arches (curvatures, articulations, neural canal) and the thickness, height and orientations of the transverse and spinous processes. (Landmarks: red, semilandmarks of curves and surfaces: blue).

Extended Data Fig. 5 Statistical validation of spine reconstructions.

a, Scatterplot of PC1 and PC2 of the four original (stars) and 24 reconstructed thoracic spines (dots: reconstructions carried out by researcher 1; open squares: reconstructions carried out by researcher 2), and the convex hulls of each spine. PC1 shows that all (except one) reconstructions plotted towards more positive PC1 scores relative to their original. Inset 3D shapes illustrate variation along PC1. The experiment indicates a systematic underestimation of the thoracic kyphosis following the standardized reconstruction methods. b, The dendrogram shows the high accuracy of the reconstructions, which is independent of the researcher. All reconstructions fall together only with their original spine.

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Supplementary methods, Tables 1–7 and references.

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Supplementary Video 1

Breathing simulation of the KNM-WT 15000 juvenile rib cage. Kinematic changes in the KNM-WT 15000 thorax are based on computer simulations of modern human axes and ranges of motion applied to the virtual 3D reconstruction of the KNM-WT 15000 thorax. Note the lateral expansion of the rib cage during inspiration. Motion was simulated for true ribs only.

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Bastir, M., García-Martínez, D., Torres-Tamayo, N. et al. Rib cage anatomy in Homo erectus suggests a recent evolutionary origin of modern human body shape. Nat Ecol Evol 4, 1178–1187 (2020). https://doi.org/10.1038/s41559-020-1240-4

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