Panamericansaurus
| Panamericansaurus | ||||||||||||
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| Temporal occurrence | ||||||||||||
| Campanium to Maastrichtian ( Upper Cretaceous ) | ||||||||||||
| 83.5 to 65.5 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Panamericansaurus | ||||||||||||
| Calvo & Porfiri , 2010 | ||||||||||||
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Panamericansaurus is a genus of sauropod dinosaur from the Titanosauria group thatlived in South Americaduring the Upper Cretaceous . The only find so far comes from the Allen Formation ( Campanium to Maastrichtian ) in the Argentine province of Neuquén . It was a close relative of the genus Aeolosaurus ; both genera are classified within the Aeolosaurini . The only species is Panamericansaurus schroederi .
features
So far only one find is known ( holotype , copy number MUCPv-417), which consists of five caudal vertebrae, a sacrum, a humerus, two hemal arches and rib fragments.
Panamericansaurus can be distinguished from related genera by characteristics based on the caudal vertebrae: For example, the anterior central caudal vertebrae show prezygapophyses (mechanical connecting elements) that are oriented anterodorsally (forwards and upwards) and were as short or shorter than the length of the vertebral centers. The upper arm bone (humerus) is more delicate than in related species.
Systematics
Panamericansaurus is considered a representative of the Aeolosaurini. This group usually includes Aeolosaurus and Gondwanatitan ; occasionally Rinconsaurus and Maxakalisaurus are assigned to this group. Santucci and colleagues (2011) come to the conclusion that Panamericansaurus , Maxakalisaurus and Rinconsaurus were more original (more basal) representatives of the Aeolosaurini than Aeolosaurus and Gondwanatitan .
Research history and naming
The remains were discovered in June 2003 during an expedition of the Universidad Nacional del Comahue near the city of San Patricio del Chañar . These are the first dinosaur fossils to be discovered from the Allen Formation in the Neuquén province. Initially, the fossils were provisionally assigned to the genus Aeolosaurus - only after extensive studies refined the distinction between Aeolosaurus and other genera, it became clear that the fossils discovered in Neuquén can be assigned to an independent genus. The new species and genus, Panamericansaurus schroederi , was established and described in 2010 by Jorge Calvo and Juan Porfiri .
The name Panamericansaurus is dedicated to the company Pan American Energy , which financially supported the research. The second part of the species name, schroederi , honors the Schroeder family, on whose land the fossils were discovered.
Individual evidence
- ↑ a b c d e f Jorge Calvo , Juan Domingo Porfiri: Panamericansaurus schroederi gen. Nov. sp. nov. Un nuevo Sauropoda (Titanosauridae-Aeolosaurini) de la Provincia del Neuquén, Cretácico Superior de Patagonia, Argentina. In: Brazilian Geographical Journal. Vol. 1, No. 1, 2010, ISSN 2179-2321 , pp. 100-115, online .
- ^ A b c Rodrigo M. Santucci, Antonio C. de Arruda-Campos. A new sauropod (Macronaria, Titanosauria) from the Adamantina Formation, Bauru Group, Upper Cretaceous of Brazil and the phylogenetic relationships of Aeolosaurini. In: Zootaxa . Vol. 3085, 2011, pp. 1–33, digital version (PDF; 2.09 MB) .
- ↑ Aldirene Costa Franco-Rosas, Leonardo Salgado, Claudio Fabián Rosas, Ismar de Souza Carvalho: Nuevos materiales de titanosaurios (Sauropoda) en el Cretacico Superior de Mato Grosso, Brazil. In: Revista Brasileira de Paleontologia. Vol. 7, No. 3, 2004, ISSN 1519-7530 , pp. 329-336, digital version (PDF; 2.29 MB) .
- ^ Gabriel Casal, Rubén Martínez, Marcelo Luna, Juan C. Sciutto, Matthew Lamanna: Aeolosaurus colhuehuapensis sp. nov. (Sauropoda, Titanosauria) de la Formación Bajo Barreal, Cretácico superior de Argentina. In: Revista Brasileira de Paleontologia. Vol. 10, No. 1, 2007, pp. 53-62, digital version (PDF; 2.85 MB) .