[dinosaur] Kwanasaurus, new silesaurid dinosauriform from Upper Triassic of Colorado (free pdf)

Ben Creisler
[email protected]

A new paper in open access:

Kwanasaurus williamparkeri, gen. et sp. nov.
Sulcimentisauria

Jeffrey W. Martz & Bryan J. Small (2019)
Non-dinosaurian dinosauromorphs from the Chinle Formation (Upper Triassic)
of the Eagle Basin, northern Colorado: Dromomeron romeri (Lagerpetidae) and
a new taxon, Kwanasaurus williamparkeri (Silesauridae).
PeerJ 7:e7551
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.7717_peerj.7551&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ekSj37CYMdrCXoHe1DRuU5J6DtC0QyOubRSWGz6FdJ4&s=CaSinON6WZ2z4MsleDD6oA5tFW3g9Tcb_HwraDY-vOo&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__peerj.com_articles_7551_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ekSj37CYMdrCXoHe1DRuU5J6DtC0QyOubRSWGz6FdJ4&s=94Cva65NIjNiTCWgD1fhWjFsLKN9VRb4ojEUI84c_pE&e= 
Free pdf:
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The "red siltstone" member of the Upper Triassic Chinle Formation in the
Eagle Basin of Colorado contains a diverse assemblage of dinosauromorphs
falling outside of Dinosauria. This assemblage is the northernmost known
occurrence of non-dinosaurian dinosauromorphs in North America, and
probably falls within the Revueltian land vertebrate estimated
biochronozone (215–207 Ma, middle to late Norian). Lagerpetids are
represented by proximal femora and a humerus referable to Dromomeron
romeri. Silesaurids (non-dinosaurian dinosauriforms) are the most commonly
recovered dinosauromorph elements, consisting of dentaries, maxillae,
isolated teeth, humeri, illia, femora, and possibly a scapula and tibiae.
These elements represent a new silesaurid, Kwanasaurus williamparkeri, gen.
et sp. nov., which possesses several autapomorphies: a short, very robust
maxilla with a broad ascending process, a massive ventromedial process, a
complex articular surface for the lacrimal and jugal, and 12 teeth; 14
dentary teeth; an ilium with an elongate and blade-like preacetabular
process and concave acetabular margin; a femur with an extremely thin
medial distal condyle and a depression on the distal end anterior to the
crista tibiofibularis. The recognition of K. williamparkeri further
demonstrates the predominantly Late Triassic diversity and widespread
geographic distribution across Pangea of the sister clade to Asilisaurus,
here named Sulcimentisauria. Silesaurid dentition suggests a variety of
dietary specializations from faunivory and omnivory in the Middle Triassic
and early Late Triassic (Carnian), to herbivory in the Late Triassic
(Carnian and Norian), with the latter specialization possibly coinciding
with the radiation of Sulcimentisauria across Pangea. The extremely robust
maxilla and folidont teeth of K. williamparkei may represent a strong
herbivorous dietary specialization among silesaurids.


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