[dinosaur] Bicentenaria (Cretaceous coelurosaur) skull anatomy

Ben Creisler
[email protected]


A new paper:

Lexis M. Aranciaga‐Rolando, Mauricio A. Cerroni & Fernando E. Novas (2019)
Skull Anatomy and Pneumaticity of the Enigmatic Coelurosaurian Theropod
Bicentenaria argentina Novas et al. (2012)
The Anatomical Record (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1002_ar.24288&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a9OObUCHSrtPoexkMEynKUsOQdnDfSWpOdlQWTZdspA&s=K-4bue7EH9bGNNacA7TTzlaVs3yzX3YrulScOLjKN-c&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__anatomypubs.onlinelibrary.wiley.com_doi_10.1002_ar.24288&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a9OObUCHSrtPoexkMEynKUsOQdnDfSWpOdlQWTZdspA&s=_6y8BzqbXhmxeVwbbzBJlsXeMPhxyDMsQCqTh9Ae7ns&e= 


The enigmatic basal coelurosaur Bicentenaria argentina is a small theropod
that comes from the Upper Cretaceous of Patagonia. It is constituted by
more than 130 elements, including cranial remains. These are represented by
an incomplete snout, palate, dermatocranium and lower jaws still in
articulation. The skull material of Bicentenaria was preliminarily studied
by previous authors. In this study, we conducted a CT scan of the holotype
of Bicentenaria which allowed us to fully describe all preserved skull
bones, including some previously unknown elements. The morphological
analysis indicates that Bicentenaria shares many cranial features with
other basal coelurosaurs as compsognathids, Ornitholestes and
tyrannosauroids. Otherwise, results of this analysis show that Bicentenaria
exhibits a set of traits unique to this taxon. Furthermore, several
pneumatic recesses were closely matched with those pneumatic features
present in many derived coelurosaurs, particularly tyrannosauroids. This
new information, together with future discoveries, will improve our
knowledge about the muscular correlates of Bicentenaria and other
coelurosaurs, and may shed light about the phylogenetic relationships of
this group.

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