The subtalar joint complex of Australopithecus sediba

Journal of Human Evolution
Thomas C Prang

Abstract

The hominin talus has figured prominently in previous studies of the functional morphology of the talocrural joint, but the talocalcaneal and talonavicular joints have received comparatively less attention despite their functional importance as components of the subtalar joint complex. An associated complete talus and calcaneus attributed to the Malapa Hominin 2 (MH2) individual of Australopithecus sediba offers the opportunity to evaluate the subtalar joint complex in an early hominin. Furthermore, detailed morphological comparisons of A. sediba to other fossil hominins such as Australopithecus africanus have not yet been conducted. Here I quantify joint curvatures and angular measurements among extant hominoids and fossil hominins to evaluate the functional morphology of the subtalar joint complex of A. sediba. Australopithecus sediba uniquely combines talocalcaneal joint morphology indicative of mobility with specializations of the talonavicular joint that provide medial midtarsal stabilization. Multivariate analyses of talus and calcaneus variables show that A. sediba is most similar to extant gorillas in the morphology of the subtalar joint complex. In contrast, other hominins, such as OH 8, are more similar to modern huma...Continue Reading

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Citations

Jun 15, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·William H Kimbel, Brian Villmoare
Jul 28, 2016·Journal of Human Evolution·Angel ZeiningerKristian J Carlson
May 26, 2017·American Journal of Physical Anthropology·Zewdi J TsegaiTracy L Kivell
Jun 9, 2017·American Journal of Physical Anthropology·Nicholas B HolowkaBrigitte Demes
Sep 23, 2018·Evolutionary Anthropology·Ellison J McNuttJeremy M DeSilva
Sep 2, 2020·American Journal of Physical Anthropology·Christine M HarperAdam D Sylvester
Dec 24, 2018·American Journal of Physical Anthropology·Jeremy DeSilvaBernhard Zipfel
Mar 21, 2020·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Shuhei NozakiNaomichi Ogihara
Jun 12, 2019·Journal of Human Evolution·D MarchiC B Ruff
Apr 25, 2017·Journal of Human Evolution·Anne Su, Kristian J Carlson
Mar 25, 2019·Journal of Human Evolution·Scott W SimpsonSileshi Semaw
Apr 13, 2021·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Christine M HarperAdam D Sylvester
Aug 5, 2021·Evolutionary Anthropology·David A Raichlen, Herman Pontzer
Aug 27, 2021·Journal of Human Evolution·Christine M HarperAdam D Sylvester
Nov 20, 2021·Surgical and Radiologic Anatomy : SRA·Elise ChuaAndrew Goldberg

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