Tracing the origin of the panda’s thumb

被引：0
作者：
Juan Abella
Alejandro Pérez-Ramos
Alberto Valenciano
David M. Alba
Marcos D. Ercoli
Daniel Hontecillas
Plinio Montoya
Jorge Morales
机构：
[1] Universidad Estatal Península de Santa Elena,Institut Català de Paleontologia Miquel Crusafont
[2] Edificio INCYT,Departamento de Ecología y Geología, Facultad de Ciencias
[3] Universitat Autònoma de Barcelona,Departamento de Geología Sedimentaria y Cambio Medioambiental
[4] Edifici ICTA-ICP,Departamento de Paleontología
[5] Universidad de Málaga,División Mastozoología
[6] Instituto de Geociencias,Departament de Geologia, Àrea de Paleontologia
[7] IGEO (CSIC,undefined
[8] UCM),undefined
[9] Universidad Complutense de Madrid,undefined
[10] Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”–CONICET,undefined
[11] Museo Nacional de Ciencias Naturales (MNCN-CSIC),undefined
[12] Universitat de València,undefined
来源：
The Science of Nature | 2015年 / 102卷
关键词：
Cerro de los Batallones; Late Miocene; Radial sesamoid; Carnivora; Ursidae;
D O I：
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学科分类号：
摘要：
We investigate the relative development of the carnivoran radial sesamoids to untangle the evolution of this iconic structure. In the pandas (both giant and red), this ‘false thumb’ is known to perform a grasping role during bamboo feeding in both the red and giant pandas. An original locomotor role has been inferred for ailurids, but this remains to be ascertained for ursids. A large sample of radial sesamoids of Indarctos arctoides from the Miocene of Batallones-3 (Spain) indicates that this early ailuropodine bear displayed a relatively hypertrophied radial sesamoid, with a configuration more similar to that of the red panda and other carnivorans than to that of giant pandas. This false thumb is the first evidence of this feature in the Ursidae, which can be linked to a more herbivorous diet. Moreover, in the two extant pandas, the false thumb should not be interpreted as an anatomical convergence, but as an exaptive convergence regarding its use during the bamboo feeding, which changes the evolutionary view of this singular structure.
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