Muyelensaurus pecheni gen. et sp.nov., preserved bones (in black) shown in a titanosaur skeletal reconstruction of LEHMAN & COULSON (2002).  

Muyelensaurus pecheni gen. et sp.nov., preserved bones (in black) shown in a titanosaur skeletal reconstruction of LEHMAN & COULSON (2002).  

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The discovery of Muyelensaurus pecheni gen. et sp.nov., a new slender titanosaurid, is relevant from anatomical and systematic viewpoints. The specimens come from the Upper Cretaceous strata of the Portezuelo Formation (Turonian-Early Coniacian) at Loma del Lindero, Rincón de los Sauces area, Neuquén Province, Argentina. The remains include a brain...

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... sternal plate (MRS-Pv 125) exhibits a typical semilunar contour, and its posterior border is not straight as that present in some titanosaurs, like Mendozasaurus and Malawisaurus (GONZÁLEZ RIGA, 2003). A complete right scapula ( Fig.12.A; MRS-Pv 259) and two partial scapular blades (MRS-Pv 396 and 397) were recovered. ...
Context 2
... humeri were collected (MRS-Pv 70, 132, 212, 352, 357, and 387). One left humerus ( Fig.12B; MRS-Pv 70) is the best preserved. ...

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... These structures become less developed, shallower, and not limited by a sharp-lipped edge throughout the anterior series of the caudal vertebrae, but they are sometimes still visible in the remaining anterior caudal vertebrae [see caudal vertebra VI of Mendozasaurus neguyelap (González Riga et al. 2018). The presence of pocdf in the anterior caudal vertebrae have been identified in several other titanosaurs such as Abdarainurus barsboldi (Averianov and Lopatin, 2020), Alamosaurus sanjuanensis (Gilmore 1946), Bonitasaura salgadoi (Gallina and Apesteguía, 2015), Dongyungosuurus sinensis (Lü et al. 2008), Epachthosaurus sciuttoi (Mannion et al. 2019b), Futalognkosaurus dukei (Mannion et al. 2019b), Malawisaurus dixeyi (Gomani 1999(Gomani , 2005, Muyelensaurus pecheni (Calvo et al. 2007a), Normanniasaurus genceyi (Le Loeuff et al. 2013;pers. observ. ...
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Titanosaurian sauropods are known to exhibit remarkable body size disparity, with some taxa famed for nearing the zenith of terrestrial vertebrate body size. Here, we describe a new titanosaurian – Ibirania parva gen. et sp. nov. – from the Upper Cretaceous (Santonian– Campanian) São José do Rio Preto Formation of Bauru Basin, in which represents one of the smallest sauropods known to date. The new taxon is diagnosed by seven autapomorphies and had an estimated body length of 5.7 m. Histological and μCT scan analyses showed that this new taxon is represented by skeletally mature individuals, which had attained somatic maturity prior to death. Phylogenetic analyses recovered the new taxon deeply nested within Saltasaurinae, a clade previously known by small-sized forms. Ibirania parva gen. et sp. nov. brings new information indicating that the body size reduction in some titanosaurians could be driven by recurrent ecophysiographical settings, present in South America prior to the diversity peak attained by the group during the Campanian–Maastrichtian.
... Mendozasaurus neguyelap was discovered in the middle-upper Coniacian Sierra Barrosa Formation, in Mendoza Province (González Riga , 2005. The anatomy of this taxon has been extensively studied (González , helping to define two new titanosaurian clades: Lognkosauria (Calvo et al. 2007a) and Colossosauria (González . Approximately 200 bones and bone fragments, which represent four individuals, were recovered from the Arroyo Seco site. ...
Chapter
Most taphonomy studies of South American sauropodomorphs have addressed extrinsic factors such as sedimentary environments, bone dispersal, and mineralogical processes that occurred during fossil diagenesis. These studies provide important data on the taphonomic modes which are associated with bone accumulations in different paleoenvironmental contexts. However, these analyses have generally not considered intrinsic factors like the shape, size, and structural integrity of the skeletal elements, variables that can produce some taphonomic bias. Sauropodomorphs include dinosaurs of highly varied sizes, ranging from small (less than 8 m long) to remarkably giant forms (around 30 m long). In the largest sauropods, such as the huge titanosaurs, very incomplete skeletons are commonly found and most notably skull and articulated pedes rarely are preserved. We focus here on some intrinsic anatomical factors as they relate to articulation in some key parts of the skeletons. Further, this study suggests that the preservation of fragile portions of sauropodomorph skeletons was possible only under specific combinations of sedimentological and biological processes.