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Datonglong, new hadrosauroid from Late Cretaceous of Tianzhen, Shanxi Province, China (free pdf)



Ben Creisler
bcreisler@gmail.com

A recent advance online paper:


Xu Shi-Chao, You Hai-Lu, WANG Jia-Wei, Wang Suo-Zhu, Yi Jian & Jia Lei (2016)
A New Hadrosauroid Dinosaur from the Late Cretaceous of Tianzhen,
Shanxi Province, China.
Vertebrata PalAsiatica 51(1): 67-78 (advance online publication)
http://www.ivpp.ac.cn/cbw/gjzdwxb/pressonline/201512/P020151218313120249494.pdf


A new non-hadrosaurid hadrosauroid dinosaur (Datonglong tianzhenensis
gen. et sp. nov.) is reported. The new taxon is recovered from the
Upper Cretaceous Huiquanpu Formation of Tianzhen County, Shanxi
Province in northern China, and represented by an almost complete
right dentary with dentition. Different from all other hadrosauroids,
Datonglong possesses two functional teeth in each alveolus, and the
pattern of ridge development on the lingual surface of its dentary
crown shows a unique combination of character states (for example:
distally offset primary ridge; well-developed secondary ridge; no
additional ridge(s); slightly distally curved apical half of primary
ridge). Comparative studies indicate advanced non-hadrosaurid
hadrosauroids experienced a complex pattern in the evolution of their
dentary, especially dentary dentition. Derived hadrosaurid features
occurred frequently in these taxa, such as high height/width ratio of
tooth crown in Bactrosaurus, one primary and one faint ridges in
Gilmoreosaurus, median placed primary ridge in Zhanghenglong,
rostrally inclined coronoid process in Nanningosaurus, and two
functional teeth in each alveolus in Datonglong. This implies
incredible diversities and attempts close to the origin of
Hadrosauridae and difficulties to elucidate their phylogenetic
relationships.