Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/42455
Title: When cotton rats grasp like pandas
Authors: Abella, Juan
Ruiz-Sánchez, Francisco J.
Valenciano, Alberto
Hontecillas, Daniel
Pérez-Ramos, Alejandro
Vera, Douglas
Santana-Cabrera, Jonathan A. 
Cornejo, María H.
Montoya, Plinio
Morales, Jorge 
UNESCO Clasification: 2416 Paleontología
Keywords: Cricetidae
Ecuador
False thumb
Santa Elena
Sigmodon
Issue Date: 2016
Journal: Journal of Mammalian Evolution 
Abstract: The panda’s false thumb is an iconic structure, described as one of the most shocking cases of anatomical convergence, and has been studied in many essays about evolution. However, in a recent paper in which we evaluated this feature within the Carnivora, we concluded that the developed radial sesamoid could be taken as a plesiomorphic character for at least the Arctoidea, rather than an anatomical convergence of the pandas (both red and giant). Following this argument, in this research we describe the action of a radial sesamoid as a real false thumb for the first time outside the mammalian carnivorans. The cricetid Sigmodon peruanus shows a very similar radial sesamoid compared to that of the giant panda (Ailuropoda melanoleuca) but somehow relatively even more developed, compared to the other bones of the manus than in the latter, showing that the use of this structure as a opposable pincer is much more expanded in mammals than thought previously.
URI: http://hdl.handle.net/10553/42455
ISSN: 1064-7554
DOI: 10.1007/s10914-015-9314-9
Source: Journal of Mammalian Evolution [ISSN 1064-7554], v. 23 (3), p. 309-317
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