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Nebulasaurus, new sauropod from Middle Jurassic of China



From: Ben Creisler
bcreisler@gmail.com


A new advance paper in open access:



Lida Xing, Tetsuto Miyashita, Philip J. Currie, Hailu You, and Zhiming
Dong (2013)
A new basal eusauropod from the Middle Jurassic of Yunnan, China, and
faunal compositions and transitions of Asian sauropodomorph dinosaurs.
Acta Palaeontologica Polonica (in press)
doi: http://dx.doi.org/10.4202/app.2012.0151
http://app.pan.pl/article/item/app20120151.html

Many sauropod ghost lineages cross the Middle Jurassic, indicating a
time for increased sampling. A wide taxonomic spectrum of
sauropodomorphs is known from the Middle Jurassic of China, but the
braincase of a new sauropod, named here Nebulasaurus taito gen. et sp.
nov., is distinct. Nebulasaurus is sister taxon to Spinophorosaurus
from the Middle Jurassic of Africa and represents a clade of basal
eusauropods previously unknown from Asia. The revised faunal list
indicates dramatic transitions in sauropodomorph faunas from the
Jurassic to Cretaceous of Asia; these are consistent with geographic
isolation of Asia through the Late Jurassic. Non-sauropod
sauropodomorphs, non-mamenchisaurid eusauropods (including basal
macronarians), and mamenchisaurids successively replaced previous
grades through the Jurassic, and titanosauriforms excluded all other
sauropod lineages across the Jurassic-Cretaceous boundary.