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Interestingly, there are variables of the rib cross section that could be associated with rib torsion and, consequently, with the morphology of the thorax. The aim of this research is to conduct a comparative study of the shape and mineralized tissues of the rib cross section in different hominids to test for significant differences and, if possible, associate them to different thoracic morphotypes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>The sample consists of the rib cross sections at the midshaft taken from 10 <jats:italic>Homo sapiens<\/jats:italic> and 10 <jats:italic>Pan troglodytes<\/jats:italic> adult individuals, as well as from <jats:italic>A. africanus<\/jats:italic> Sts 14. The shape of these rib cross sections was quantified using geometric morphometrics, while the mineralized tissues were evaluated using the compartmentalization index. Subsequently, covariation between both parameters was tested by a Spearman's <jats:italic>\u03c1<\/jats:italic> test, a permutation test and a linear regression.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Generally, <jats:italic>P. troglodytes<\/jats:italic> individuals exhibit rib cross sections that are rounder and more mineralized compared to those of <jats:italic>H. sapiens<\/jats:italic>. However, the covariation between both parameters was only observed in typical ribs (levels 3\u201310). Although covariation was not found in the rib cross sections of Sts 14, their parameters are closer to <jats:italic>P. troglodytes<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>On the one hand, the differences observed in the rib cross sections between <jats:italic>H. sapiens<\/jats:italic> and <jats:italic>P. troglodytes<\/jats:italic> might be related to different degrees of rib torsion and, consequently, to different thoracic 3D configurations. These findings can be functionally explained by considering their distinct modes of breathing and locomotion. On the other hand, although the rib cross sections belonging to Sts 14 are more similar to those of <jats:italic>P. troglodytes<\/jats:italic>, previous publications determined that their overall morphology is closer to modern humans. This discrepancy could reflect a diversity of post\u2010cranial adaptations in <jats:italic>Australopithecus<\/jats:italic>.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ajpa.24844","type":"journal-article","created":{"date-parts":[[2023,9,19]],"date-time":"2023-09-19T09:14:17Z","timestamp":1695114857000},"page":"157-164","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Covariation between the shape and mineralized tissues of the rib cross section in <scp><i>Homo sapiens<\/i><\/scp>, <scp><i>Pan troglodytes<\/i><\/scp> and <scp>Sts 14<\/scp>"],"prefix":"10.1002","volume":"183","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0148-5666","authenticated-orcid":false,"given":"Jos\u00e9 M.","family":"L\u00f3pez\u2010Rey","sequence":"first","affiliation":[{"name":"Laboratorio de Poblaciones del Pasado (LAPP), Department of Biology, Faculty of Sciences Universidad Aut\u00f3noma de Madrid  Madrid 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Gonz\u00e1lez","sequence":"additional","affiliation":[{"name":"Laboratorio de Poblaciones del Pasado (LAPP), Department of Biology, Faculty of Sciences Universidad Aut\u00f3noma de Madrid  Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c1ngeles","family":"S\u00e1nchez\u2010Andr\u00e9s","sequence":"additional","affiliation":[{"name":"Department of Life Sciences Universidad de Alcal\u00e1 (UAH)  Alcal\u00e1 de Henares Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mirriam","family":"Tawane","sequence":"additional","affiliation":[{"name":"Department of Paleontology Ditsong National Museum of Natural History  Pretoria South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7194-5958","authenticated-orcid":false,"given":"Marine","family":"Cazenave","sequence":"additional","affiliation":[{"name":"Division of Anthropology American Museum of Natural History  New York New York 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