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[dinosaur] Dinodontosaurus (Therapsida), new specimen from Triassic of Argentina




Ben Creisler
bcreisler@gmail.com

A new paper:

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MarÃa de los Angeles OrdoÃez, Claudia A. Marsicano & Adriana C. Mancuso (2020)
New specimen of Dinodontosaurus (Therapsida, Anomodontia) from west-central Argentina (ChaÃares Formation) and a reassessment of the Triassic Dinodontosaurus Assemblage Zone of southern South America.
Journal of South American Earth Sciences ÂArticle 102597
doi: https://doi.org/10.1016/j.jsames.2020.102597
https://www.sciencedirect.com/science/article/abs/pii/S0895981120301103

Highlights

Dinodontosaurus basicranium structure using 3D model and digital segmentation.
Late Triassic Dinodontosaurus AZ shows unlike body-size distributions among basins.
The difference can link with variable local climate conditions and landscapes.

AbstractÂ

The ChaÃares Formation is known worldwide for its diverse tetrapod assemblage, including representatives of proterochampsid archosauromorphs, early offshoots of the crocodilian lineage, precursors of the dinosaurian lineage, and dicynodont and cynodont therapsids. The dicynodont Dinodontosaurus, originally described nearly 80 years ago, is the most common dicynodont therapsid in the assemblage. Here we present a new specimen of this taxon, focusing on the basicranium structure using 3D modeling and digital segmentation of the individual bones to provide a novel description of this region of the skull. Among the newly-recognized anatomical structures are a rod-like pila antotica in the prootic, the presence of a dorsal conical projection of the parasphenoid, and the anterior extension of the supraoccipital between the prootic and the parietal. The ChaÃares tetrapod assemblage was historically correlated with the Dinodontosaurus Assemblage Zone of Southern Brazil, originally due to the presence of this large dicynodont, as well as the cynodont Massetognathus, and more recently by absolute dates of the fossil-bearing strata. Both assemblages are similar in diversity and taxonomy, particularly in their non-mammalian therapsids; however their body-size distributions are very different. These differences in body-size are likely not reflecting a taphonomic bias but local variations in climate that promoted more open landscapes in southern Brazil in contrast to western Argentina, where more humid conditions prevailed during the early Late Triassic.

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