Early euprimates already had a diverse locomotor repertoire: Evidence from ankle bone morphology
Monclús-Gonzalo, Oriol (Institut Català de Paleontologia Miquel Crusafont)
Alba, David M.. (Institut Català de Paleontologia Miquel Crusafont)
Duhamel, Anaïs (University of Lyon)
Fabre, Anne-Claire (University of Bern)
Marigó Cortés, Judit (Universitat Autònoma de Barcelona. Departament de Geologia)

Data:	2023
Resum:	The morphological adaptations of euprimates have been linked to their origin and early evolution in an arboreal environment. However, the ancestral and early locomotor repertoire of this group remains contentious. Although some tarsal bones like the astragalus and the calcaneus have been thoroughly studied, the navicular remains poorly studied despite its potential implications for foot mobility. Here, we evaluate early euprimate locomotion by assessing the shape of the navicular-an important component of the midtarsal region of the foot-using three-dimensional geometric morphometrics in relation to quantified locomotor repertoire in a wide data set of extant primates. We also reconstruct the locomotor repertoire of representatives of the major early primate lineages with a novel phylogenetically informed discriminant analysis and characterize the changes that occurred in the navicular during the archaic primate-euprimate transition. To do so, we included in our study an extensive sample of naviculars (36 specimens) belonging to different species of adapiforms, omomyiforms, and plesiadapiforms. Our results indicate that navicular shape embeds a strong functional signal, allowing us to infer the type of locomotion of extinct primates. We demonstrate that early euprimates displayed a diverse locomotor behavior, although they did not reach the level of specialization of some living forms. Finally, we show that the navicular bone experienced substantial reorganization throughout the archaic primate-euprimate transition, supporting the major functional role of the tarsus during early primate evolution. This study demonstrates that navicular shape can be used as a reliable proxy for primate locomotor behavior. In addition, it sheds light on the diverse locomotor behavior of early primates as well as on the archaic primate-euprimate transition, which involved profound morphological changes within the tarsus, including the navicular bone.
Ajuts:	Agencia Estatal de Investigación PID2020-116908GB-I00 Agencia Estatal de Investigación PID2020-117289GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2022/SGR-01188 Agència de Gestió d'Ajuts Universitaris i de Recerca 2022/SGR-00620 Ministerio de Ciencia e Innovación RYC2021-034366-I Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/FI_B-00524 Agència de Gestió d'Ajuts Universitaris i de Recerca 2022/FI_B1-00131
Nota:	Altres ajuts: acords transformatius de la UAB
Nota:	Altres ajuts:CLT_2022_EXP_ARQ001SOLC_00000197 financed by the Culture Department of the Generalitat de Catalunya.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial 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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Early euprimates ; Locomotor repertoire ; Geometric morphometrics ; Functional morphology ; Paleogene ; Navicular
Publicat a:	Journal of human evolution, Vol. 181 (August 2023) , art. 103395, ISSN 0047-2484

DOI: 10.1016/j.jhevol.2023.103395

14 p, 2.2 MB

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