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Omeisaurus jiaoi, new species of sauropod ( free pdf)



From: Ben Creisler
bh480@scn.org

In new Vertebrata Palasiatica at:
http://english.ivpp.cas.cn/sp/PalAsiatica/vp_list/201102/t20110216_65121.htm
l
 (pdfs are free):


JIANG Shan, LI Fei, PENG Guang-Zhao, & YE Yong (2011).
A NEW SPECIES OF OMEISAURUS FROM THE MIDDLE JURASSIC OF ZIGONG, SICHUAN.
Vertebrata Palasiatica 49(2): 185-194.
http://www.ivpp.cas.cn/cbw/gjzdwxb/xbwzxz/201105/P020110530509590205314.pdf

Omeisaurus jiaoi, a new species of giant sauropod is described in this
paper. The specimen (ZCM 5050) was discovered from the Xiashaximiao
Formation of the Middle Jurassic of Zigong Dinosaur Museum, Sichuan.

ZDM 5050 is a nearly complete skeleton. Its main features can be summarized
as follows: dorsal vertebrae are tall and large. The anterior dorsal
vertebrae (dorsals 1 to 6) are opisthocoelous. The pleurocoels of the
dorsal vertebrae are well developed except on the 1st dorsal. The neural
spines are club-like and neural spines of the anterior dorsal vertebrae are
not bifurcated. Caudal vertebrae are relatively short and thick. The
anterior caudal vertebrae are slightly amphicoelous. The chevron of the 1st
caudal vertebrae of Omeisaurus tianfuensis have no chevron. The rib of the
1st caudal vertebrae are laterally directed, being slightly fan-shaped.
Humerus is long and straight, with slightly expanded proximal end and
greatly expanded distal end. The deltopectoral crest is well-developed and
relatively low. Femur is slender in shape, with greatly expanded proximal
and distal ends. The fourth trochanter is well-developed. The ratio of the
humerus to femur length is approximately 0.83, the ratio of the ulna to
humerus length is approximately 0.72, and ratio of the tibia to femur
length is approximately 0.63.



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