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Teyujagua, early mosaic relative of archosauriforms from Lower Triassic of Brazil (free pdf)

Ben Creisler

A new paper:

Felipe L. Pinheiro, Marco A. G. França, Marcel B. Lacerda, Richard J.
Butler & Cesar L. Schultz (2016)
An exceptional fossil skull from South America and the origins of the
archosauriform radiation.
Scientific Reports 6, Article number: 22817
http: // www.nature.com/articles/srep22817

Birds, dinosaurs, crocodilians, pterosaurs and their close relatives
form the highly diverse clade Archosauriformes. Archosauriforms have a
deep evolutionary history, originating in the late Permian, prior to
the end-Permian mass extinction, and radiating in the Triassic to
dominate Mesozoic ecosystems. However, the origins of this clade and
its extraordinarily successful body plan remain obscure. Here, we
describe an exceptionally preserved fossil skull from the Lower
Triassic of Brazil, representing a new species, Teyujagua paradoxa,
transitional in morphology between archosauriforms and more primitive
reptiles. This skull reveals for the first time the mosaic assembly of
key features of the archosauriform skull, including the antorbital and
mandibular fenestrae, serrated teeth, and closed lower temporal bar.
Phylogenetic analysis recovers Teyujagua as the sister taxon to
Archosauriformes, and is congruent with a two-phase model of early
archosauriform evolution, in response to two mass extinctions
occurring at the end of the Guadalupian and the Permian.



http: // www.birmingham.ac.uk/schools/gees/news/2016/11Mar-reptile-fossil.aspx

http: // 

http: // www.bbc.com/news/science-environment-35783598