quinta-feira, 17 de julho de 2008

Maxakalisaurus topai

Maxakalisaurus topai Kellner, Campos, Azevedo, Trotta, Henriques, Craik & Silva, 2006

Place: Adamantina Formation, Serra da Boa Vista, Minas Gerais State;
Time: Maastrichtian, Late Cretaceous;
Size: 13 meters-long;
Taxonomy: Saurischia, Sauropodomorpha, Sauropoda, Titanosauria, Saltasauridae;
Etymology: from Maxakali, ethnic group present in the Minas Gerais State where this fossil was found. The specific name is from Topa, a deity worshiped by the Maxakali people.
Art: Orlando Grillo (right)
Kellner, A. W. A., D. A. Campos, S. A. K. Azevedo, M. N. F. Trotta, D. D. R. Henriques, M. M. T. Craik and H. P. Silva (2006). On a new titanosaur sauropod from the Bauru Group, Late Cretaceous of Brazil. Bol. Mus. Nac., N.S., Geol., Rio de Janeiro, n.74, p.1-31, ago.2006

It is the biggest dinosaur found in Brasil, a titanosaur characterized by the following combination of features: tail composed of anterior and midposterior caudal vertebrae with the anterior (and posterior) surface of the centrum dorsoventrally compressed; midposterior caudal vertebrae with the lateral surface of the centrum strongly concave (spool-shaped); dorsal margin of neural spine in midposterior caudal vertebrae inclined anteriorly; presence of at least one midposterior caudal with biconvex centrum; metacarpal IV about 12% shorter than metacarpal II; sacral centrum with keel-shaped ventral surface. Associated material – The distal end of a right scapula (MN 7048-V) and two sternal plates (MN 7049-V and MN 7050-V) of a second animal attributed to Maxakalisaurus
topai, one caudal vertebra (MN 7051-V) that may or not pertain to this species, and crocodylomorph and theropod teeth.

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