[dinosaur] Redescription of Jiangshanosaurus and Dongyangosaurus, Cretaceous sauropods from Zhejiang Province, China (free pdf)

Ben Creisler
[email protected]


A new paper with free pdf:

Philip D. Mannion, Paul Upchurch, Xingsheng Jin and Wenjie Zheng (2019)
New information on the Cretaceous sauropod dinosaurs of Zhejiang Province,
China: impact on Laurasian titanosauriform phylogeny and biogeography.
Royal Society Open Science 6(8): 191057
doi:  https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1098_rsos.191057&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=1JSJ3_PVsM8hxdHVXjQWW8lcfoVWlN636SNniA_KKeI&s=l_OCzIUbmo4nWtmKlLRjY7vkYwyU4l0lnwOmB3GQzoo&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__royalsocietypublishing.org_doi_10.1098_rsos.191057&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=1JSJ3_PVsM8hxdHVXjQWW8lcfoVWlN636SNniA_KKeI&s=l0PEBbv7_gKgMDVR_0-nG0o_Ibv9wCK4penx7SQHMms&e= 


Titanosaurs were a globally distributed clade of Cretaceous sauropods.
Historically regarded as a primarily Gondwanan radiation, there is a
growing number of Eurasian taxa, with several putative titanosaurs
contemporaneous with, or even pre-dating, the oldest known Southern
Hemisphere remains. The early Late Cretaceous Jinhua Formation, in Zhejiang
Province, China, has yielded two putative titanosaurs, Jiangshanosaurus
lixianensis and Dongyangosaurus sinensis. Here, we provide a detailed
re-description and diagnosis of Jiangshanosaurus, as well as new anatomical
information on Dongyangosaurus. Previously, a 'derived' titanosaurian
placement for Jiangshanosaurus was primarily based on the presence of
procoelous anterior caudal centra. We show that this taxon had amphicoelous
anterior-middle caudal centra. Its only titanosaurian synapomorphy is that
the dorsal margins of the scapula and coracoid are approximately level with
one another. Dongyangosaurus can clearly be differentiated from
Jiangshanosaurus, and displays features that indicate a closer relationship
to the titanosaur radiation. Revised scores for both taxa are incorporated
into an expanded phylogenetic data matrix, comprising 124 taxa scored for
548 characters. Under equal weights parsimony, Jiangshanosaurus is
recovered as a member of the non-titanosaurian East Asian somphospondylan
clade Euhelopodidae, and Dongyangosaurus lies just outside of Titanosauria.
However, when extended implied weighting is applied, both taxa are placed
within Titanosauria. Most other 'middle' Cretaceous East Asian sauropods
are probably non-titanosaurian somphospondylans, but at least
Xianshanosaurus appears to belong to the titanosaur radiation. Our analyses
also recover the Early Cretaceous European sauropod Normanniasaurus genceyi
as a 'derived' titanosaur, clustering with Gondwanan taxa. These results
provide further support for a widespread diversification of titanosaurs by
at least the Early Cretaceous.

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