[dinosaur] Teyujagua (Lower Triassic archosauromorph) osteology and early archosauriform skull

Ben Creisler
[email protected]


A new paper:

Felipe L. Pinheiro, Daniel De Simão-Oliveira & Richard J. Butler (2019)
Osteology of the archosauromorph Teyujagua paradoxa and the early evolution
of the archosauriform skull.
Zoological Journal of the Linnean Society, zlz093
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1093_zoolinnean_zlz093&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=9WoCF59STjDQz3HB-b2dQ9vF_XlLWtucfANbrlGwaIU&s=w37wxac8QGXDyorHwPbUdq-lM4bkSvGfj4KyxnHDfzI&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__academic.oup.com_zoolinnean_advance-2Darticle-2Dabstract_doi_10.1093_zoolinnean_zlz093_5585773&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=9WoCF59STjDQz3HB-b2dQ9vF_XlLWtucfANbrlGwaIU&s=cvMDRj9rYAHMhluzFbgJm_wrgLfSzLaWrDyqSnaxrOI&e= 


Archosauriformes are a major group of fossil and living reptiles that
include the crown group Archosauria (birds, crocodilians and their extinct
relatives) and closely related taxa. Archosauriformes are characterized by
a highly diagnostic skull architecture, which is linked to the predatory
habits of their early representatives, and the development of extensive
cranial pneumaticity associated with the nasal capsule. The evolution of
the archosauriform skull from the more plesiomorphic configuration present
ancestrally in the broader clade Archosauromorpha was, until recently,
elusive. This began to change with the discovery and description of
Teyujagua paradoxa, an early archosauromorph from the Lower Triassic Sanga
do Cabral Formation of Brazil. Here, we provide a detailed osteological
description of the holotype and, thus far, only known specimen of T.
paradoxa. In addition to providing new details of the anatomy of T.
paradoxa, our study also reveals an early development of skull pneumaticity
prior to the emergence of the antorbital fenestra. We use these new data to
discuss the evolution of antorbital openings within Archosauriformes.
Reappraisal of the phylogenetic position of T. paradoxa supports previous
hypotheses of a close relationship with Archosauriformes. The data
presented here provide new insights into character evolution during the
origin of the archosauriform skull.

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