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YIMENOSAURUS

a plant-eating sauropodamorph dinosaur from the Early Jurassic of China.
Pronunciation: yee-MUHN-o-SOR-us
Meaning: Yimen lizard
Author/s: Bai, Yang and Wang (1990)
Synonyms: None known
First Discovery: Yimen, China
Chart Position: 283

Yimenosaurus youngi

Yimenosaurus is an Early Jurassic plant-munching dinosaur known as a sauropodamorph (aka a prosauropod) that was initially described as a plateosaurid resembling Plateosaurus and Lufengosaurus, although it doesn't seem to be particularly Plateosaurus-or-Lufengosaurus-like.

Its skull is twice as high as it is long, but it isn't that long, and sports long slender teeth, a rounded snout and lots of load-lightening "windows" including huge eye sockets and nostrils, while its hips are huge and its limbs are robust with massive ankles, short but wide feet, long and robust metatarsals and rather short and thick toes. All in all, the body of Yimenosaurus is chunky and heavyset in a similar vein as the advanced sauropodomorphs known as sauropods, and like the latter its head seems undersized and delicately-built by comparison.

Barring the arms, most of the skeleton is known thanks to several individual specimens, many of which were badly weathered and damaged during excavation and preparation, and had to be stuck back together before study could begin. Therefore, Yimenosaurus received only a preliminary description courtesy of Bai, Yang and Wang with the promise of a more indepth report at a later date, but that was two decades ago as of 2010 and no-one has so much as poked it with a stick since. If ever a dinosaur needed a revisit...
Etymology
Yimenosaurus is derived from "Yimen" (for Yimen County) and the Greek "sauros" (lizard).
The species epithet, youngi, is a romanization of the surname of Professor Yang Zhongjian (C.C. Young), the founder of vertebrate paleontology in China and a provider of outstanding contributions to prosauropod research in Yunnan Province.
Discovery
The first remains of Yimenosaurus were discovered in the Fengjiahe Formation at Jiaojiadian in Yimen County, Yunnan Province, China, by Mr. Xingyong Zhang in August of 1987. The holotype (YXV8701) is a damaged skeleton with an incomplete skull and lower jaw. The paratype (YXV8702) is a somewhat larger specimen that includes lots of bits which are missing from the holotype. Both specimens are housed at the Yuxi Regional Administrative Academy of Yunnan.
Estimations
Timeline:
Era: Mesozoic
Epoch: Early Jurassic
Stage: Pliensbachian-Toarcian
Age range: 190-176 mya
Stats:
Est. max. length: 7 meters
Est. max. hip height: ?
Est. max. weight: 700 Kg
Diet: Herbivore
Family Tree:
Dinosauria
Saurischia
Sauropodomorpha
Prosauropoda
Yimenosaurus
youngi
References
• Ziqi Bai, Jie Yang, and Guohui Wang (1990) "A new genus of prosauropod dinosaur from the Yuxi (region) of Yunnan Province, China". Yuxiwenbo (Yuxi Culture and Scholarship), Volume 1, pp. 14-23.
• G.S. Paul (2010) "The Princeton Field Guide to Dinosaurs".
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To cite this page:
Atkinson, L. "YIMENOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 27th Jun 2017.
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