Femoral neck cortical bone distribution in Nacholapithecus from the Middle Miocene of Kenya
Tomizawa, Yuma (Kyoto University)
Pina, Marta (Institut Català de Paleontologia Miquel Crusafont)
Kikuchi, Yasuhiro (Saga University)
Morimoto, Naoki (Kyoto University)
Nakatsukasa, Masato (Kyoto University)

Date:	2025
Abstract:	Nacholapithecus kerioi from the Middle Miocene (16-15 Ma) of the Aka Aitheputh Formation in Kenya is represented by abundant postcranial fossils. Their morphology suggests that the body plan of N. kerioi was similar to that of primitive apes, which do not specialize in suspensory locomotion, and that this taxon generally engaged in arboreal quadrupedalism (Nakatsukasa et al. , 1998, 2007; Ishida et al. , 2004; Nakatsukasa and Kunimatsu, 2009; Almécija et al. , 2021; Pina et al. , 2021; Pina and Nakatsukasa, 2024). However, some forelimb features suggest a derived locomotor pattern indicative of incipient forelimb dominance (Nakatsukasa et al. , 1998, 2004, 2007, 2012; Ishida et al. , 2004; Takano et al. , 2018, 2020). For example, KNM-BG 35250 has a bulbous and rounded humeral capitulum, which contributes to the stabilization of the elbow during protonation/supination movements (Ishida et al. , 2004; Takano et al. , 2018). Overall, N. kerioi may have mainly relied on cautious arboreal quadrupedalism, occasionally engaging in some kind(s) of antipronograde locomotor mode(s).
Grants:	Agencia Estatal de Investigación PID2020-116908GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2022/BP-00265 European Commission 801370
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Fossil African apes ; Femur ; Cortical thickness ; Locomotion
Published in:	Journal of Human Evolution, Vol. 198 (January 2025) , art. 103617, ISSN 1095-8606

DOI: 10.1016/j.jhevol.2024.103617

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut Català de Paleontologia Miquel Crusafont (ICP)
Articles > Research articles
Articles > Published articles