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

Markus Bastir, Daniel García-Martínez, Nicole Torres-Tamayo, Carlos A. Palancar, Benoît Beyer, Alon Barash, Chiara Villa, Juan Alberto Sanchis-Gimeno, Alberto Riesco-López, Shahed Nalla, Isabel Torres-Sánchez, Francisco García-Río, Ella Been, Asier Gómez-Olivencia, Martin Haeusler, Scott A. Williams, Fred Spoor

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

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.

Original languageEnglish
Pages (from-to)1178-1187
Number of pages10
JournalNature Ecology and Evolution
Volume4
Issue number9
DOIs
StatePublished - 1 Sep 2020

Bibliographical note

Publisher Copyright:
© 2020, The Author(s), under exclusive licence to Springer Nature Limited.

Funding

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).

FundersFunder number
European Commission’s Research Infrastructure ActionBE-TAF-5639, DE-TAF-6404, SE-TAF-6406
Eusko Jaurlaritza-Gobierno VascoRYC-2017-22558
FEDER/Ministerio de Ciencia e Innovación-AEIIT1418-19, PGC2018-093925-B-C33
IdEx University of Bordeaux Investments for the Future programmeANR-10-IDEX-03-02
Mäxi Foundation
Spanish Ministry of Economy and Competitivity
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung31003A_176319/1
Ministerio de Economía y CompetitividadCGL 2015-63648-P
Ministerio de Economía, Industria y Competitividad, Gobierno de España

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