Re: [dinosaur] Xunmenglong, new compsognathid theropod from Lower Cretaceous of China

Fun fact: "xunmenglong" is one of the popular Chinese names used for
*Velociraptor*. The authors must have known what they were doing with that
one...

On Sat, Oct 26, 2019 at 2:59 AM Ben Creisler <[email protected]> wrote:

>
> Ben Creisler
> [email protected]
>
>
> A new paper:
>
>
> Xunmenglong yinliangis gen. et sp. nov.
>
> Lida Xing, Tetsuto Miyashita, Donghao Wang, Kechung Niud & Philip J.Currie
> (2019)
> A new compsognathid theropod dinosaur from the oldest assemblage of the
> Jehol Biota in the Lower Cretaceous Huajiying Formation, northeastern China.
> Cretaceous Research (adavance online  publication)
> doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.cretres.2019.104285&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=z75t7QbF-qYiE9OJ_xwXXWlsQGirgGoKd5TO4WYwx2A&s=Pcy0RFQGCgO3-zbeAVJh7Stl2RcEOQ2UgnTKyHwJPPU&e= 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.cretres.2019.104285&d=DwMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=5nLvM6q-t5026idTNfrVk6iAPflqcc6HHtWk45dX6hA&s=L8dy4mmQeYbWa0pkS5de0mT8WM3iwhXtWnYRa5btHD8&e=>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0195667119302381&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=z75t7QbF-qYiE9OJ_xwXXWlsQGirgGoKd5TO4WYwx2A&s=D6VOJZ_u2iSbCKj7NsGTyQXA8YaTCV-1EftUVRhX01I&e= 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0195667119302381&d=DwMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=5nLvM6q-t5026idTNfrVk6iAPflqcc6HHtWk45dX6hA&s=xYhM20BWmkg12NPZhPURlgHlIZYvO1l9EGzio2Osn1g&e=>
>
>
> Compsognathids -- long regarded as an assemblage of 'prototypical' small
> theropods including the historically significant Compsognathus and
> Sinosauropteryx -- have patchy distributions. The majority of definitive
> members of the clade come from the Upper Jurassic Solnhofen Archipelago and
> the Lower Cretaceous Yixian Formation. Chronologically falling between
> these two major compsognathid localities, a new compsognathid described in
> this paper, Xunmenglong yinliangis gen. et sp. nov, occurs in the Huajiyin
> Formation of northeastern China. Xunmenglong is distinguished from other
> compsognathids by one autapomorphy (pedal phalanx IV-4 longer than IV-3)
> and a unique combination of postcranial traits, including the
> disproportionately long lower legs. Nested among the Jehol and Solnhofen
> compsognathids in a phylogenetic analysis, Xunmenglong is an intriguing
> addition to the known range and diversity of the clade. The taxon is
> stratigraphically the lowest among Asian compsognathids, and its holotype
> specimen is the smallest among compsognathids (unless Scipionyx is treated
> as a compsognathid). Questions remain about habitat preferences and
> diversification patterns of compsognathids, but Xunmenglong offers two
> broader implications. (1) As previously proposed on the basis of the
> diverse enanthiornithine assemblage, the Huajiying Formation may preserve
> the oldest fauna of the Early Cretaceous Jehol Biota, which is distinct
> from the Late Jurassic Daohugou Biota and includes the Yixian Formation
> from which other Asian compsognathids were discovered. (2) Xunmenglong
> provides a useful calibration point with which to reconstruct
> biogeographic/stratigraphic patterns and to estimate allometric trends in
> the clade.
>
>
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