SciELO - Scientific Electronic Library Online

 
vol.43 número1La icnofacies de Glossifungites en el contacto entre las formaciones Navidad (Miembro Rapel) y La Cueva, Plioceno de la Cordillera de la Costa, Chile: su significado estratigráfico-secuencialUna asociación de braquiópodos de rampa externa de la parte superior de la formación San Juan (Arenigiano medio), norte de la Precordillera Argentina: implicancias paleoecológicas y biogeográficas índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

  • No hay articulos citadosCitado por SciELO

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Bookmark


Ameghiniana

versión On-line ISSN 1851-8044

Resumen

VIZCAINO, Sergio F.; BARGO, M. Susana  y  CASSINI, Guillermo H.. Dental occlusal surface area in relation to body mass, food habits and other biological features in fossil xenarthrans. Ameghiniana [online]. 2006, vol.43, n.1, pp. 11-26. ISSN 1851-8044.

The Xenarthra includes the most intriguing mammals from the Cenozoic of South America: the glyptodonts (Cingulata) and the ground sloths (Tardigrada). Their masticatory apparatuses are diverse and peculiar, with a strongly reduced, hypselodont dentition that lacks enamel and displays different degrees of lobation. The goal of this study is to investigate the relationship between dental occlusal surface area (OSA) and diet, and other physiological factors in fossil xenarthrans. Over one hundred and fifty specimens, including living herbivorous epitherians and both extinct and living xenarthrans, were measured and photographed, and their OSA estimated and plotted against body mass. For most fossil xenarthrans OSA is smaller than expected for extant herbivorous mammals of equivalent body size. Within xenarthrans, cingulates show the highest OSA values, suggesting more extensive oral food processing than in tardigrades. Among ground sloths, mylodontids have extremely low OSA values, suggesting low efficiency in oral food processing that was probably compensated by high fermentation in the digestive tract, or lower metabolic requirements, or a combination of both adaptations. On the other hand, Megatherium americanum has an OSA expected for, or even higher than that of, a mammal of its size, which indicates higher oral food processing, lower fermentation capacity, and/or higher metabolic requirements.

Palabras llave : Mammalia; Xenarthra; Dental Occlusal Surface Area; Body mass; Diet; Physiology.

        · resumen en Español     · texto en Inglés