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Sinosaurus (theropod from Early Jurassic of China) braincase anatomy (free pdf)



Ben Creisler
bcreisler@gmail.com

A new paper (in open access at the link):


Xing Lida,  Ariana Paulina-Carabajal,  Philip J. Currie,  Xu Xing,
Zhang Jianping,  Wang Tao, Michael E. Burns &  Dong Zhiming (2014)
Braincase Anatomy of the Basal Theropod Sinosaurus from the Early
Jurassic of China.
Acta Geologica Sinica 88(6):1653-1664 (English Edition)
http://www.geojournals.cn/dzxben/ch/reader/view_abstract.aspx?file_no=201406002&flag=1



The neuroanatomy of the mid-sized theropod Sinosaurus triassicus from
the Lower Jurassic Lufeng Formation, Lufeng Basin in Yunnan Province,
China was studied using X-ray computed tomography. The braincase is
characterized by a large supraoccipital knob that is capped by a
posterior projection of the parietal and two external foramina for the
caudal middle cerebral vein, which is completely enclosed by the
supraoccipital. The basicranium has well defined, short basipterygoid
processes that project ventral to the basal tubera. The basisphenoid
is expanded, projects posteroventrally, and is pierced by four
pneumatic recesses. The endocranial morphology resembles that observed
in other basal theropods—in particular some allosauroids—and has a
strongly marked pontine flexure and a large dorsal expansion. The
inner ear morphology is also similar to that observed in other basal
theropods, with slender semicircular canals. The anterior semicircular
canal is 20% larger than the posterior semicircular canal, and the
angle formed between them is less than 90° when seen in dorsal view.