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Chuanqilong, new ankylosaur from Lower Cretaceous of Liaoning Province, China

Ben Creisler

New in PLoS ONE:

Fenglu Han, Wenjie Zheng, Dongyu Hu, Xing Xu & Paul M. Barrett (2014)
A New Basal Ankylosaurid (Dinosauria: Ornithischia) from the Lower
Cretaceous Jiufotang Formation of Liaoning Province, China.
PLoS ONE 9(8): e104551.

A new ankylosaurid, Chuanqilong chaoyangensis gen. et sp. nov., is
described here based on a nearly complete skeleton from the Lower
Cretaceous Jiufotang Formation of Baishizui Village, Lingyuan City,
Liaoning Province, China. Chuanqilong chaoyangensis can be diagnosed
on the basis of two autapomorphies (glenoid fossa for quadrate at same
level as the dentary tooth row; distally tapering ischium with
constricted midshaft) and also a unique combination of character
states (slender, wedge-like lacrimal; long retroarticular process;
humerus with strongly expanded proximal end; ratio of humerus to femur
length = 0.88). Although a phylogenetic analysis places Chuanqilong
chaoyangensis as the sister taxon of the sympatric Liaoningosaurus
near the base of the Ankylosauridae, the two taxa can be distinguished
on the basis of many features, such as tooth morphology and ischial
shape, which are not ontogeny-related. Chuanqilong chaoyangensis
represents the fourth ankylosaurid species reported from the
Cretaceous of Liaoning, China, suggesting a relatively high diversity
in Cretaceous Liaoning.