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Título: Dermal armor histology of Saltasaurus loricatus, an Upper Cretaceous sauropod dinosaur from Northwest Argentina
Autor: Cerda, Ignacio A.
Powell, Jaime E.
Fecha de publicación: sep-2010
Citación: Cerda, Ignacio A., Powell, Jaime E. (2010). Dermal armor histology of Saltasaurus loricatus, an Upper Cretaceous sauropod dinosaur from Northwest Argentina. Polish Academy of Sciences. Institute of Paleobiology; Acta Palaeontologica Polonica; 55; 3; pp. 389-398
Revista: Acta Palaeontologica Polonica
Resumen: The first unambiguous evidence of the presence of osteoderms in sauropod dinosaurs came from the discovery of Saltasaurus loricatus, a titanosaur from the Upper Cretaceous of Argentina. The dermal armor of Saltasaurus is composed of bony plates and small dermal ossicles. Here, we analyze the bone microstructure of these elements and provide information regarding its origin and development. The bony plates are composed almost entirely of reconstructed cancellous bone. Remains of primary bone consist of coarse bundles of mineralized collagenous fibers towards the external surface. Also, woven fibered bone tissue appears in the basal and lateral regions. Dermal ossicles lack secondary remodeling, and their matrix is formed by three orthogonal systems of collagenous fiber bundles. Growth lines are present in both bony plates and ossicles. Bone histology reveals that osteoderms mainly originated through direct mineralization (metaplasia) of the dermis, although other mechanisms are also involved (at least in the origin of dermal plates). The common features of development and integumental location of the osteoderms of Saltasaurus and other non-related vertebrates (e.g., lepidosaurs, crocodylomorphs) are linked to the intrinsic skeletogenic properties of the dermis.
URI: http://www.app.pan.pl/article/item/app20091101.html
http://dx.doi.org/10.4202/app.2009.1101
http://hdl.handle.net/11336/73560
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2614
ISSN: 0567-7920
1732-2421
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Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899