Translator Disclaimer
1 September 2011 Patrones de Desgaste y Oclusión en el Sistema Masticatorio de los Extintos Argyrolagoidea (Marsupialia, Polydolopimorphia, Bonapartheriiformes)
Natalia Zimicz
Author Affiliations +
Abstract

WEAR PATTERN AND OCCLUSION IN THE MASTICATORY SYSTEM OF EXTINCT ARGYROLAGOIDEA (MARSUPIALIA, POLYDOLOPIMORPHIA, BONAPARTHERIIFORMES). The Argyrolagoidea (Mammalia, Marsupialia, Polydolopimorphia, Bonapartheriiformes) display a pattern of cusp contact that is quite different from any other group of South American metatherians during dental occlusion. The resulting pattern of wear facets is also exclusive for this group. In part, this is due to the highly derived molar morphology of argyrolagoids as compared to the generalized tribosphenic pattern. The location and relative development of wear facets indicate that chewing movements were composed of propalinal and ectental components, resulting in an oblique motion. This type of masticatory dynamics correlates with the argyrolagoid molar pattern, including a reorganization of cusps and the addition of neomorphic structures. This pattern of molar wear, the occlusal movements, and the acquisition of hypsodonty strongly support the hypothesis of an herbivorous diet for this group. The occurrence of hypsodonty in South American metatherians already by the early Oligocene appears to be a remarkably rapid response to environmental changes. Body mass estimates are consistent with those of many small herbivores (i.e., rodents).

Natalia Zimicz "Patrones de Desgaste y Oclusión en el Sistema Masticatorio de los Extintos Argyrolagoidea (Marsupialia, Polydolopimorphia, Bonapartheriiformes)," Ameghiniana 48(3), 358-379, (1 September 2011). https://doi.org/10.5710/AMGH.v48i3 (472)
Received: 14 February 2011; Accepted: 28 July 2011; Published: 1 September 2011
JOURNAL ARTICLE
22 PAGES


Share
SHARE
KEYWORDS
body size
Cambio climático
Climatic change
Dental occlusion
Facetas de desgaste
Herbivoría
herbivory
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top