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Mosaic morphology in the thorax of Australopithecus sediba


Schmid, P; Churchill, S E; Nalla, S; Weissen, E; Carlson, K J; de Ruiter, D J; Berger, L R (2013). Mosaic morphology in the thorax of Australopithecus sediba. Science, 340(6129):1234598.

Abstract

The shape of the thorax of early hominins has been a point of contention for more than 30 years. Owing to the generally fragmentary nature of fossil hominin ribs, few specimens have been recovered that have rib remains complete enough to allow accurate reassembly of thoracic shape, thus leaving open the question of when the cylindrical-shaped chest of humans and their immediate ancestors evolved. The ribs of Australopithecus sediba exhibit a mediolaterally narrow, ape-like upper thoracic shape, which is unlike the broad upper thorax of Homo that has been related to the locomotor pattern of endurance walking and running. The lower thorax, however, appears less laterally flared than that of apes and more closely approximates the morphology found in humans.

Abstract

The shape of the thorax of early hominins has been a point of contention for more than 30 years. Owing to the generally fragmentary nature of fossil hominin ribs, few specimens have been recovered that have rib remains complete enough to allow accurate reassembly of thoracic shape, thus leaving open the question of when the cylindrical-shaped chest of humans and their immediate ancestors evolved. The ribs of Australopithecus sediba exhibit a mediolaterally narrow, ape-like upper thoracic shape, which is unlike the broad upper thorax of Homo that has been related to the locomotor pattern of endurance walking and running. The lower thorax, however, appears less laterally flared than that of apes and more closely approximates the morphology found in humans.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Anthropology
Dewey Decimal Classification:300 Social sciences, sociology & anthropology
Language:English
Date:2013
Deposited On:03 Jan 2014 11:21
Last Modified:08 Dec 2017 01:20
Publisher:American Association for the Advancement of Science
ISSN:0036-8075
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1126/science.1234598
PubMed ID:23580537

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