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New sauropod dinosaur material from Jones Ranch: a large Comanchean nonmammalian tetrapod from Texas

Published online by Cambridge University Press:  23 September 2013

D. A. Winkler ,
M. J. Polcyn  and
L. L. Jacobs
D. A. Winkler
Affiliation:
Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX 75275, USA Email: [email protected]; [email protected]; [email protected]
M. J. Polcyn
Affiliation:
Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX 75275, USA Email: [email protected]; [email protected]; [email protected]
L. L. Jacobs
Affiliation:
Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX 75275, USA Email: [email protected]; [email protected]; [email protected]
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Abstract

New sauropod dinosaur material is described from Jones Ranch, Early Cretaceous of Texas (USA). Originally described as Paluxysaurus jonesi, the material from Jones Ranch has recently been referred to Sauroposeidon proteles. Elements newly prepared from dense concretionary matrix include the sacrum, ilium and proximal portion of the tail. Reconstructions of the skull and sacrum plus pelvic girdles are presented. ‘Paluxysaurus jonesi’ (=S. proteles) is a blunt-faced sauropod that was originally regarded as closely related to Brachiosaurus. Portions of the sacrum are now exposed and show that it is nearly complete, missing only parts of the first sacral (S1). The anterior sacrals are firmly fused, however, a newly discovered opisthocoelous last sacral (S6) remains unfused. A complete sequence of proximal caudal vertebrae shows a rapid transition from anteroposteriorly short and mediolaterally broad centra anteriorly, to more elongate cylindrical centra posteriorly. All proximal caudals have slightly amphicoelous centra. Some middle anterior caudals have a shallow longitudinal groove on the ventral surface of the centrum. Specimens from Jones Ranch exhibit characters of the sacrum and tail that clearly corroborate placement of ‘P. jonesi’ (Sauroposeidon proteles) as a somphospondylan titanosauriform.

Keywords

anatomyCretaceousrelationshipsSauropodaUSA
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 103 , Issue 3-4: The Full Profession: A Celebration of the Life and Career of Wann Langston, Jr., Quintessential Vertebrate Palaeontologist , September 2012 , pp. 459 - 469
Copyright
Copyright © The Royal Society of Edinburgh 2013 

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References

7. References

Carballido, J. L., Pol, D., Cerda, I. & Salgado, L. 2011. The osteology of Chubutisaurus insignis del Corro, 1975 (Dinosauria: Neosauropoda) from the ‘middle’ Cretaceous of central Patagonia, Argentina. Journal of Vertebrate Paleontology 31 (1), 93–110.Google Scholar
Carpenter, K. & Tidwell, V. 1998. Preliminary description of a Brachiosaurus skull from Felch Quarry 1, Garden Park, Colorado. Modern Geology 23 (14), 69–84.Google Scholar
Chure, D., Britt, B., Whitlock, J. & Wilson, J. 2010. First complete sauropod dinosaur skull from the Cretaceous of the Americas and the evolution of sauropod dentition. Naturwissenschaften 97 (4), 379–91.Google Scholar
D'Emic, M. D. & Foreman, B. Z. 2012. The beginning of the sauropod dinosaur hiatus in North America: insights from the Lower Cretaceous Cloverly Formation of Wyoming. Journal of Vertebrate Paleontology 32 (4), 883–902.CrossRefGoogle Scholar
Gallina, P. A. & Otero, A. 2009. Anterior caudal transverse processes in sauropod dinosaurs: Morphological, phylogenetic and functional aspects. Ameghiniana 46 (1), 165–76.Google Scholar
Gallup, M. R. 1989. Functional morphology of the hindfoot of the Texas sauropod Pleurocoelus sp. indet.In Farlow, J. O. (ed.) Paleobiology of the Dinosaurs. Geological Society of America Special Paper 238, 71–74.Google Scholar
Janensch, W. 1950. Die Wirbelsäule von Brachiosaurus brancai. Palaeontographica (Supplement 7), 3 (2), 27–93.Google Scholar
Langston, W. Jr. 1974. Nonmammalian Comanchean tetrapods. Geoscience and Man 8, 77–102.Google Scholar
Lehman, T. M. & Coulson, A. B. 2002. A juvenile specimen of the sauropod dinosaur Alamosaurus sanjuanensis from the Upper Cretaceous of Big Bend National Park, Texas. Journal of Paleontology 76 (1), 156–72.Google Scholar
Madsen, J. H. Jr., McIntosh, J. S. & Berman, D. S. 1995. Skull and atlas-axis complex of the Upper Jurassic sauropod Camarasaurus Cope (Reptilia: Saurischia). Bulletin of the Carnegie Museum of Natural History 31, 1–115.CrossRefGoogle Scholar
Mannion, P. D. & Calvo, J. O. 2011. Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian–early Cenomanian) Rio Limay Formation, Neuquen Province, Argentina: Implications for titanosaur systematics. Zoological Journal of the Linnean Society 163 (1), 155–81.Google Scholar
Rose, P. J. 2007. A new titanosauriform sauropod (Dinosauria: Saurischia) from the Early Cretaceous of central Texas and its phylogenetic relationships. Palaeontologia Electronica 10 (2), 8A1–65.Google Scholar
Taylor, M. P. 2009. A re-evaluation of Brachiosaurus altithorax Riggs 1903 (Dinosauria, Sauropoda) and its generic separation from Giraffatitan brancai (Janensch 1914). Journal of Vertebrate Paleontology 29 (3), 787–806.CrossRefGoogle Scholar
Taylor, M. P., Wedel, M. J. & Cifelli, R. L. 2011. A new sauropod dinosaur from the Lower Cretaceous Cedar Mountain Formation, Utah, USA. Acta Palaeontologica Polonica 56 (1), 75–98.CrossRefGoogle Scholar
Tidwell, V., Carpenter, K. & Brooks, W. 1999. New sauropod from the Lower Cretaceous of Utah, USA. Oryctos 2, 21–37.Google Scholar
Wedel, M. J., Cifelli, R. L. & Sanders, R. K. 2000. Sauroposeidon proteles, a new sauropod from the Early Cretaceous of Oklahoma. Journal of Vertebrate Paleontology 20 (1), 109–14.Google Scholar
Wilson, J. A. 2002. Sauropod dinosaur phylogeny: Critique and cladistic analysis. Zoological Journal of the Linnean Society 136, 217–76.Google Scholar
Wilson, J. A. & Upchurch, P. 2009. Redescription and reassessment of the phylogenetic affinities of Euhelopus zdanskyi (Dinosauria: Sauropoda) from the Early Cretaceous of China. Journal of Systematic Palaeontology 7 (2), 199–239.Google Scholar
Winkler, D. A. & Rose, P. J. 2006. Paleoenvironment at Jones Ranch, an Early Cretaceous sauropod quarry in Texas, U.S.A. Journal of the Paleontological Society of Korea 22 (1), 77–89.Google Scholar