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Nebulasaurus, new sauropod from Middle Jurassic of China
From: Ben Creisler
A new advance paper in open access:
Lida Xing, Tetsuto Miyashita, Philip J. Currie, Hailu You, and Zhiming
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)
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.