Quilmesaurus

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Quilmesaurus
Temporal occurrence
Upper Cretaceous ( Campanium to Maastrichtian )
83.6 to 66 million years
Locations
Systematics
Dinosaur (dinosauria)
Lizard dinosaur (Saurischia)
Theropoda
Ceratosauria
Abelisauroidea
Quilmesaurus
Scientific name
Quilmesaurus
Coria , 2001
species
  • Quilmesaurus curriei

Quilmesaurus is a dubious (dubious) genus of theropod dinosaur from the Upper Cretaceous Argentina . The only find so far consists only of the right shin and the lower end of the right femur and comes from the Allen Formation ( Campanian to Maastrichtian ). It is assigned to the Abelisauroidea , a group within the Ceratosauria , and within this group probably belonged to the Abelisauridae . Quilmesaurus wasscientifically described in 2001 by Rodolfo Coria with the only species Quilmesaurus curriei .

Research history and naming

The find (copy number MPCA-PV-100) was discovered in the late 1980s by an excavation team from the Universidad Nacional de Tucumán under the direction of Jaime Eduardo Powell . It comes from fluvial sandstones from the lower area of ​​the Allen Formation. It was the first find of a theropod to be discovered within this formation . The site ( Salitral Ojo de Agua ) is located south of the city of General Roca in the Argentine province of Río Negro .

The name Quilmesaurus refers to the Quilmes tribe . The second part of the species name, curriei , honors the eminent Canadian paleontologist Philip Currie .

features

The body length of this animal was estimated to be 6.3 to 8 meters based on the reconstructed length of the thigh bone. Compared to other abelisaurids, the leg bones are long and slender. The classification within the Abelisauridae is supported, among other things, by the strong expression of the mediodistal ridge at the lower end of the thigh bone. An unusual feature is the hook-shaped cnemial ridge , a prominent bone ridge on the front of the upper end of the tibia.

Systematics and validity

Originally, Rodolfo Coria (2001) classified Quilmesaurus as a theropod with unknown family relationships. Coria ruled out an assignment to the Ceratosauria, as the shin shows no signs of fusion with the bones of the ankle, as is the case with other representatives of the Ceratosauria known at the time. Today, however, a similar anatomy has also been proven in other Ceratosauria such as Majungasaurus . The find is currently classified within the Abelisauroidea, various features also indicate a position within the Abelisauridae. In the new description of the fossil in 2007, Juárez Valieri and colleagues come to the conclusion that it may be ascribed to the Carnotaurinae , a subgroup of the Abelisauridae.

In a new description of the fossil published in 2007, Quilmesaurus is declared as a noun dubium , as no features could be found by which this genus can be distinguished from other genera ( autapomorphies ).

supporting documents

literature

  • Matthew T. Carrano, Scott D. Sampson: The Phylogeny of Ceratosauria (Dinosauria: Theropoda). In: Journal of Systematic Palaeontology. Vol. 6, No. 2, 2008, ISSN  1477-2019 , pp. 183-236, doi : 10.1017 / S1477201907002246 .
  • Rodolfo A. Coria : A new theropod from the Late Cretaceous of Patagonia. In: Darren H. Tanke, Kenneth Carpenter (Eds.): Mesozoic vertebrate life. Indiana University Press, Bloomington IN et al. 2001, ISBN 0-253-33907-3 , pp. 3-9.
  • Fernando E. Novas : The age of dinosaurs in South America. Indiana University Press, Bloomington IN 2009, ISBN 978-0-253-35289-7 .
  • Joshua B. Smith, Matthew C. Lamanna, Achmed S. Askar, Khalid A. Bergig, Sefau O. Tshakreen, Miloud M. Abugares, D. Tab Rasmussen : A Large Abelisauroid Theropod Dinosaur from the Early Cretaceous of Libya. In: Journal of Paleontology. Vol. 84, No. 5, 2010, ISSN  0022-3360 , pp. 927-934, doi : 10.1666 / 09-152.1 .
  • Rubén D. Juárez Valieri, Lucas E. Fiorelli, Laura E. Cruz: Quilmesaurus curriei Coria 2001 (Dinosauria, Theropoda). Su valid taxonómica y relaciones filogenéticas. In: Revista del Museo Argentino de Ciencias Naturales. NS Vol. 9, No. 1, 2007, ISSN  1514-5158 , pp. 59-66, digital version (PDF; 1.64 MB) .

Individual evidence

  1. ↑ a b Ben Creisler: Dinosauria Translation and Pronunciation Guide. Archived from the original on July 20, 2011 ; Retrieved October 14, 2012 .
  2. ↑ a b c d Juárez Valieri et al. , P. 59
  3. ↑ a b c Coria 2001
  4. ↑ a b Novas 2009 , p. 285
  5. ^ Smith 2010 , p. 930
  6. ↑ a b Carrano and Sampson , pp. 208-209