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



Datanglong, Datonglong... a nightmare for popular science. :)

2015-12-21 8:43 GMT+01:00 Ben Creisler <bcreisler@gmail.com>:
> 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.



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