[dinosaur] Sanxiasaurus, new neornithischian from Middle Jurassic of China

Ben Creisler
[email protected]


A new paper:


Sanxiasaurus modaoxiensis gen. et sp. nov.

Ning Li, Hui Dai, Chao Tan, Xufeng Hu, Zhaoying Wei, Yu Lin, Guangbiao Wei,
Deliang Li, Li Meng, Baoqiao Hao, Hailu You & Guangzhao Peng (2019)
A neornithischian dinosaur from the Middle Jurassic Xintiangou Formation of
Yunyang, Chongqing, China: the earliest record in Asia.
Historical Biology (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_08912963.2019.1679129&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=hbgmajM2m610JDvEhrjWg5z0mANwnQ9kfGsbSTSPAtA&s=QxcWRx6jgZ10LEN_JjGwDQDFAXlSH965_nDcdqorNT0&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_08912963.2019.1679129&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=hbgmajM2m610JDvEhrjWg5z0mANwnQ9kfGsbSTSPAtA&s=Bz-i7dzLgNZieqoARNY6rWQXVPgfq0VsO-NRygMLs0Y&e= 


A new neornithischian dinosaur, Sanxiasaurus modaoxiensis gen. et sp. nov.,
is described based on a partial postcranial skeleton from the Middle
Jurassic Xintiangou Formation of Yunyang, Chongqing Municipality, China. It
is the first neornithischian dinosaur from the Middle Jurassic Xintiangou
Formation of Sichuan Basin, and also the earliest record of a
neornithischian dinosaur in Asia. It differs from other neornithischians in
possessing the following unique combination of characters: at least four
sacrals; humerus strongly bowed laterally along its length; obturator
process located at mid-length of ischial shaft; lesser trochanter of femur
broadened, wing shaped and subequal in anteroposterior width to greater
trochanter; distal tibia with elongate posterolateral process. Phylogenetic
analysis shows that Sanxiasaurus modaoxiensis is positioned near the base
of neornithischia. This find extends the Asia neornithischian stratigraphic
horizon to the lower Middle Jurassic.

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