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2010 | 55 | 3 |
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Dermal armor histology of Saltasaurus loricatus, an Upper Cretaceous sauropod dinosaur from Northwest Argentina

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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.
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  • Museo Universidad Nacional del Comahue, Buenos Aires 1400, [8300]Neuguen, Argentina
  • Azevedo, S.A.K. and Kellner, A.W.A. 1998. A titanosaurid (Dinosauria, Sauropoda) osteoderm from the Upper Cretaceous of Minas Gerais, Brazil. Boletim Do Museu Nacional (Río de Janeiro) 44: 1–6.
  • Barrett, P.M., Clarke, J.B., Brinkman, D.B., Champman, S.D., and Ensom, P.C. 2002. Morphology, histology and identification of the “granicones” from the Purbeck Limestone Formation (Lower Cretaceous: Berriasian) of Dorset, southern England. Cretaceous Research 23: 279–295.
  • Bonaparte, J.F. and Powell, J.E. 1980. A continental assemblage of tetrapods from the Upper Cretaceous beds of El Brete, northwestern Argentina (Sauropoda–Coelurosauria–Carnosauria–Aves). Mémoires de la Société Géologique de France 139: 19–28.
  • Buffrénil, V. de, Farlow, J.O., and Ricqlès, A. de 1986. Growth and function of Stegosaurus plates: evidence from bone histology. Paleobiology 12: 459–473.
  • Burns, M.E. 2008. Taxonomic utility of ankylosaur (Dinosauria, Ornithischia) osteoderms: Glyptodontopelta mimus Ford, 2000: a test case. Journal of Vertebrate Paleontology 28: 1102–1109.
  • Chiappe, L.M., Coria, R.A., Dingus, L., Jackson, F., Chinsamy, A., and Fox, M. 1998. Sauropod dinosaur embryos from the Late Cretaceous of Patagonia. Nature 396: 258–261.
  • Chinsamy, A. and Raath, M.A. 1992. Preparation of fossil bone for histological examination. Paleontologia Africana 29: 39–44.
  • Coria, R.A. and Chiappe, L.M. 2007. Embryonic skin from Late Cretaceous sauropods (Dinosauria) of Auca Mahuevo, Patagonia, Argentina. Journal of Paleontology 81: 1528–1532.
  • D’Emic, M.D., Wilson, J.A., and Chatterjee, S. 2009. The titanosaur (Dinosauria: Sauropoda) osteoderm record: review and first definitive specimen from India. Journal of Vertebrate Paleontology 29: 165–177.
  • Depéret, C. 1896. Note sur le dinosauriens sauropodes et théropodes du Crétacé Supérieur de Madagascar. Bulletin de la Société Géologique de France 24: 176–194.
  • Dodson, P., Krause, D.W., Forster, C.A., Sampson, S.D., and Ravoavy, F. 1998. Titanosaurid (Sauropoda) osteoderms from the Late Cretaceous of Madagascar. Journal of Vertebrate Paleontology 18: 563–568.
  • Erickson, G.M. and Brochu, C.A. 1999. How the “terror crocodile” grew so big. Nature 398: 205–206.
  • Erickson, G.M., Ricqlès, A. de, Buffrénil, V. de, Molnar, R.E., and Bayless, M.K. 2003. Vermiform bones and the evolution of gigantism in Megalania—How a reptilian fox became a lion. Journal of Vertebrate Paleontology 23: 966–970.
  • Francillon−Vieillot, H., Buffrénil, V. de, Castanet, J., Géraudie, J., Meunier, F.J., Sire, J.Y., Zylberberg, L., and Ricqlès, A. de 1990. Microstructure and mineralization of vertebrate skeletal tissues. In: J.G. Carter (ed.), Skeletal Biomineralization: Patterns, Process and Evolutionary Trends, 471–548. Van Nostrand Reinhold, New York.
  • Gomani, E.M. 2005. Sauropod dinosaur from the Early Cretaceous of Malawi, Africa. Palaeontologia Electronica 8 (27A): 37.
  • González Riga, B.J. 2003. A new titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous of Mendoza Province, Argentina. Ameghiniana 40: 155–172.
  • Haines, R.W. 1969. Epiphyses and sesamoids. In: C. Gans and A. d’Bellairs (eds.), Biology of the Reptilia, 81–144. Academics Press, New York.
  • Haines, R.W. and Mohuiddin, A. 1968. Metaplastic bone. Journal of Anatomy 103: 527–538.
  • Hayashi, S., Carpenter, K., and Suzuki, D. 2009. Different growth patterns between the skeleton and osteoderms of Stegosaurus (Ornithischia: Thyreophora). Journal of Vertebrate Paleontology 29: 123–131.
  • Hill, R.V. 2006. Comparative anatomy and histology of xenarthran osteoderms. Journal of Morphology 267: 1441–1460.
  • Huene, F. von 1929. Los saurisquios y ornitisquios del Cretáceo Argentino. Anales del Museo de La Plata (Series 2) 3: 1–196.
  • Hutton, J.M. 1986. Age determination of living Nile crocodiles from the cortical stratification of bone. Copeia 2: 332–341.
  • Kellner, A.W.A., Campos, D.A., Azevedo, Z.A.K., Trota, M.N.F., Enriques, D.D.R., Craik, M.M.T., and Paula Silva, H. 2006. A new titanosaur sauropod from the Bauru Group, Late Cretaceous of Brazil. Boletim do Museu Nacional 74: 1–31.
  • Le Loeuff, J., Buffetaut, E., Cavin, L., Martin, M., Martin, V., and Tong, H. 1994. An armoured titanosaurid sauropod from the Late Cretaceous of Southern France and the occurrence of osteoderms in the Titanosauridae. Gaia 10: 155–159.
  • Levrat−Calviac, V. and Zylberberg, L. 1986. The structure of the osteoderms in the gekko: Tarentola mauritanica. The American Journal of Anatomy 176: 437–466.
  • Main, R.P., Ricqlès, A. de, Horner, J.R., and Padian, K. 2005. The evolution and function of thyreophoran dinosaur scutes: implications for plate function in stegosaurs. Paleobiology 31: 291–314.;2
  • Marinho, T.S. and Candeiro, C.R.A. 2005. Titanosaur (Dinosauria: Sauropoda) osteoderms from the Maasctrichtian of Uberaba, Minas Gerais State, Brazil. Gondwana Research 8: 473–477.−937X(05)71149-7
  • Moss, M.L. 1969. Comparative histology of dermal sclerifications in reptiles. Acta Anatomica 73: 510–533.
  • Moss, M.L. 1972. The vertebrate dermis and the integumental skeleton. American Zoologist 12: 27–34.
  • O’Leary, M.A., Roberts, E.M., Head, J.J., Sissoko, F., and Bouaré, M.L. 2004. Titanosaurian (Dinosauria: Sauropoda) remains from the “Continetal Intercalaire” of Mali. Journal of Vertebrate Paleontology 24: 923–930.;2
  • Powell, J.E. 1980. Sobre la presencia de armadura dérmica en algunos dinosaurios titanosáuridos. Acta Geológica Lilloana 15: 41–47.
  • Powell, J.E. 2003. Revision of South American titanosaurid dinosaurs: palaeobiological, palaeobiogeographical and phylogenetic aspects. Records of the Victoria Museum 111: 1–173.
  • Reid, R.E.H. 1996. Bone histology of the Cleveland−Lloyd dinosaurs and of dinosaurs in general. Part I: Introduction to bone tissues. Brigham Young University Geology Studies 41: 25–72.
  • Ricqlès, A. de, Pereda Suberbiola, X., Gasparini, Z., and Olivero, E. 2001. Histology of the dermal ossifications in an ankylosaurian dinosaur from the Late Cretaceous of Antartica. Asociación Paleontológica Argentina, Publicación Especial 7: 171–174.
  • Salgado, L. 2003. Considerations on the bony plates assigned to titanosaurs (Dinosauria, Sauropoda). Ameghiniana 40: 441–456.
  • Salgado, L., Apesteguía, S., and Heredia, S.E. 2005. A new specimen of Neuquensaurus australis, a Late Cretaceous saltasaurine titanosaur from North Patagonia. Journal of Vertebrate Paleontology 25: 623–634. http:// D2.0.CO;2
  • Salgado, L. and Coria, R. 1993. El género Aeolosaurus(Sauropoda, Titanosauridae) en la Formación Allen (Campaniano–Maastrichtiano) de la provincia de Río Negro. Ameghiniana 30: 119–128.
  • Sanz, J.L. and Buscalioni, A.D. 1987. New evidence of armored dinosaurs in the Upper Cretaceous of Spain. In: P.M. Currie and E.H. Koster (eds.), 4th Symposium of Mesozoic Terrestrial Ecosystems. Short Papers, 199–204. Royal Tyrrel Museum, Paleontology, Drumheller.
  • Sanz, J.L., Powell, J.E., Le Loeuff, J., Martínez, R., and Pereda Suberbiola, X. 1999. Sauropod remains from the Upper Cretaceous of Laño (Northcentral Spain). Titanosaur phylogenetic relationships. Estudios del Museo de Ciencias Naturales de Lava 14 (número especial 1): 235–255.
  • Scheyer, T.M. 2007. Comparative Bone Histology of the Turtle Shell (Carapace and Plastron): Implications for Tturtle Systematics, Functional Morphology, and Turtle Origins. 343 pp. Unpublished Ph.D. thesis. University of Bonn, Bonn. URN:
  • Scheyer, T.M. and Sánchez−Villagra, M.R. 2007. Carapace bone histology in the giant pleurodiran turtle Stupendemys geographicus: phylogeny and function. Acta Palaeontologica Polonica 52: 137–154.
  • Scheyer, T.M. and Sander, P.M. 2004. Histology of ankylosaur osteoderms: implications for systematics and function. Journal of Vertebrate Paleontology 24: 874–893. %5B0874:HOAOIF%5D2.0.CO;2
  • Scheyer, T.M. and Sander, P.M. 2007. Shell bone histology indicates terrestrial palaeoecology of basal turtles. Proceedings of the Royal Society B 274: 1884–1893.
  • Scheyer, T.M. and Sander, P.M. 2009. Bone microstructures and mode of skeletogenesis in osteoderms of three pareiasaur taxa from the Permian of South Africa. Journal of Evolutionary Biology 22: 1153–1162.
  • Scheyer, T.M., Sander, P.M., Joyce, W.G., Böhme, W., and Witzel, U. 2007. Unique plywood structure in the shell of fossil and recent softshelled turtles (Trionychidae) revealed by soft tissue and bone histology: a key adaptation? Organisms, Diversity and Evolution 7: 136–144.
  • Sire, J.−Y. Dononghue, P.C.J., and Vickaryous, M.K. 2009. Origin and evolution of the integumentary skeleton in non−tetrapod vertebrates. Journal of Anatomy 214: 409–440.
  • Tucker, A.D. 1997. Validation of skeletochronology to determine age of freshwater crocodiles (Crocodylus johnstoni). Marine and Freshwater Research 48: 343–351.
  • Upchurch, P., Barrett, P.M., and Dodson, P. 2004. Sauropoda. In: D.B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria, 259–322. University of California Press, Berkeley.
  • Vickaryous, M.K. and Hall, B.K. 2006. Osteoderm morphology and development in the nine−banded armadillo, Dasypus novemcinctus (Mammalia, Xenarthra, Cingulata). Journal of Morphology 267: 1273–1283.
  • Vickaryous, M.K. and Hall, B.K. 2008. Development of the dermal skeleton in Alligator mississippiensis(Archosauria, Crocodylia) with comments on the homology of osteoderms. Journal of Morphology 269: 398–422.
  • Vickaryous, M.K. and Sire, J.−Y. 2009. The integumentary skeleton of tetrapods: origin, evolution, and development. Journal of Anatomy 214: 441–464.
  • Zylberberg, L. and Castanet, J. 1985. New data on the structure and the growth of the osteoderms in the reptile Anguis fragilis L. (Anguidae, Squamata). Journal of Morphology 186: 327–342.
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