6533b838fe1ef96bd12a3ad4
RESEARCH PRODUCT
false
Plinio MontoyaGema SiliceoMauricio AntónJuan AbellaManuel J. SalesaJorge Moralessubject
Phylogenetic treebiologyTremarctinaeZoologyGeologyAnatomyThumbbiology.organism_classificationSymplesiomorphymedicine.anatomical_structureAiluropodinaeMelanoleucabiology.animalmedicineTremarctos ornatusAiluropoda melanoleucadescription
We describe for the first time the radial sesamoid or “false thumb” of the spectacled bear (Tremarctos ornatus), showing its great morphological similarities with that of the giant panda (Ailuropoda melanoleuca) and the differences with that of the rest of the Ursidae. This points to the existence of a common origin for this structure in both species, but considering the accepted phylogenies of ursids, the sharing of a “false thumb” in T. ornatus and A. melanoleuca would be a plesiomorphy for these groups, whereas in the rest of the ursids the radial sesamoid was probably reduced, lacking the specialised function that this bone has in Tremarctinae and Ailuropodinae.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-12-30 | Estudios Geológicos |