CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
New approach to the paleobiology of Glyptodon Owen (Cingulata, Glyptodontidae) through the osteoderms microstructure
Autor/es:
PRIETO, M. CECILIA; LUNA, CARLOS A.; ZURITA, ALFREDO E.; CUADRELLI, FRANCISCO
Lugar:
La Plata
Reunión:
Congreso; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; 2019
Institución organizadora:
Asociación Paleontológica Argentina
Resumen:
Glyptodon Owen is one of the most frequently recorded glyptodonts in the Pleistocene of South America.This allowed study different aspects of its paleobiology, such as ontogenetic and intraspecific variations, development of accessory protective structures, among other. In this contribution, the bone compactness (proportion of bone tissue in a section area) of the Glyptodon osteoderms from several individuals (CTES-PZ 7818; PVE-F 154; MAMM-PV 048; MCNC-PV 246; MCA 2013; MAMM-PV 153; MCNC-PV-284; CTES-PZ 7601) with different ontogenetic stage is analyzed. The osteoderms of dorsal carapace of sampled juvenile Glyptodon had an average compactness of 62.5 % with a standard deviation of 3.5 %, while in the adults we found a similar average value (62.7 %), but a higher standard deviation (11.21 %). The morphology of the adult osteoderms indicates that the variation in compactness is related to the position within the carapace, something that in juveniles is not so evident. In adults it was possible to calculate the compactness in other regions of the carapace. The osteoderms of the margin of the carapace presented variations in the compactness, being lowest in the anterior-lateral region (39.3 %) and highly compacted towards the caudal edge (83.2 %).The cephalic shield and caudal armor showed the highest compactness values (84.17 % and 86.43 %, respectively), probably related to some protection function; meanwhile within the dorsal carapace the compactness increases toward the posterior region, where osteoderms are also thicker. This high degree of compaction in this region of the carapace agrees with the high compactness of posterior long bones, previously reported.