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

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On Tue, Sep 3, 2019 at 8:11 AM Ben Creisler <[email protected]> wrote:

>
> 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=lhAhXM7_nDxhwFNhNkjtdaqkmB1QZIST0YMBvRevT8k&s=wniJAmh8obxI84_tfWFTal3m11kL2ZBvB6L0u8fIcNQ&e= 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__peerj.com_articles_7551_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=lhAhXM7_nDxhwFNhNkjtdaqkmB1QZIST0YMBvRevT8k&s=hPPEWtxVT3SCswVt5vPlBrxJ6FfQn8o_uJdCY62yy3E&e= 
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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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