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Zuoyunlong, new basal hadrosauroid from Late Cretaceous of China
A new paper:
Run-Fu Wang, Hai-Lu You, Suo-Zhu Wang, Shi-Chao Xu, Jian Yi, Li-Juan
Xie, Lei Jia & Hai Xing (2015)
A second hadrosauroid dinosaur from the early Late Cretaceous of
Zuoyun, Shanxi Province, China.
Historical Biology (advance online publication)
A second basal hadrosauroid dinosaur, Zuoyunlong huangi gen. et sp.
nov., is reported from the early Late Cretaceous Zhumapu Formation in
Zuoyun County, Shanxi Province, northern China. Zuoyunlong preserves a
partial right ilium and ischium and is unique in having a very short
postacetabular process 50% as long as the iliac central plate. Our
cladistic analysis recovers Zuoyunlong as the most basal Late
Cretaceous hadrosauroid, with a sister taxon relationship with
Probactrosaurus from the late Early Cretaceous of Inner Mongolia.
Including Zuoyunlong, four Cenomanian basal hadrosauroids have been
recorded, and the two taxa in North America (Eolambia and Protohadros)
represent the earliest known hadrosauroids outside of Asia. In the
light of the proposed phylogenetic topology and biogeographic data,
the discovery of Zuoyunlong indicates that the first dispersal of
hadrosauroids from Asia to North America probably happened around the
boundary between the Early and Late Cretaceous.