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Thalattosaurs from Triassic of China: Concavispina (new) and Xinpusaurus



From: Ben Creisler
bcreisler@gmail.com

Also in the new issue of Vertebrata PalAsiatica:


In Chinese:

ZHAO Li-Jun, LIU Jun, LI Chun & HE Tao (2013)
A new thalattosaur, Concavispina biseridens gen. et sp.nov. from
Guanling, Guizhou, China.
Vertebrata PalAsiatica 51: 24-28
http://www.ivpp.cas.cn/cbw/gjzdwxb/xbwzxz/201301/P020130131403966569577.pdf


A new thalattosaur, Concavispina biseridens gen. et sp. nov., is
established on the basis of a new skeleton from Xiaowa Formation of
Guangling, Guizhou, China. It is diagnosed by two rows of blunt teeth
on anterior part of maxilla and V-shaped notch on the dorsal margin of
neural spines in dorsal vertebrae. It shares three derived characters
only with Xinpusaurus: anterior end of maxilla curved dorsally;
cervical vertebrae less than five; proximal end of humerus wider than
distal end. This indicates that the new taxon may have a closely
relationship with Xinpusaurus.

==

In English:

LIU Jun (2013)
On the taxonomy of Xinpusaurus (Reptilia: Thalattosauria).
Vertebrata PalAsiatica 51: 17-23
http://www.ivpp.cas.cn/cbw/gjzdwxb/xbwzxz/201301/P020130131404692609056.pdf



After examining the holotypes and the referred specimens of three
species of Xinpusaurus, I conclude that the snout and the shape of the
dentary cannot be used to differentiate the known species of
Xinpusaurus and that the postcranial diagnostic characters of X. kohi
cannot be confrmed because of the poor preservation; so both X.
bamaolinensis and X. kohi should be junior synonyms of X. suni. The
anatomy of the braincase of this taxon is further clarifed.