a plant-eating anchisaurian sauropodomorph dinosaur from the Early Jurassic of China.
C.C. Young (1940
China have the monopoly on dinosaurs beginning with the letter "Y" and Yunnanosaurus huangi — an Early Jurassic non-sauropod sauropodomorph (aka "prosauropod") — was the first of many. Well, at least seven.
Its spoon-shaped teeth were constantly spooning each other, and the non-stop rubbing as it ate means they were self-sharpening. Amongst primitive creatures such as Yunnanosaurus this was considered a mod-con, akin to finding an Ipod Nano attached to a Morris Minor, and although self-sharpening teeth are common in earlyish macronarian sauropods such as Brachiosaurus they weren't close relatives.
(Yunnan Lizard from Huangchiatien)Etymology
is derived from "Yunnan" (for Yunnan Province) and the Greek "sauros" (lizard).
The species epithet
, is named for the Huang
The first fossils of Yunnanosaurus
were discovered at Huangchiatien in the Zhangjiawa Member of the Lufeng Formation, Yunnan, China.
(IVPP AS V.20) is a partial skeleton missing a skull and bits of its front and hind legs.
(including its lapsus calami Yuannanosaurus robustas
, Young 1982) was coined in 1951 for IVPP V93 from Huangchiatien by C-C Young, based on its more robust build compared to Yunnanosaurus huangi
from exactly the same area. At that time the latter was only known from juvenile specimens and most paleontologists now treat the pair as synonymous, with the former as the adult form. That said, Toru Sekiya assigned a juvenile specimen (ZMNH-M8739) from Chuxiong Yi Autonomous Prefecture to Y. robustus
: Early Jurassic
: 201-189 mya
Est. max. length
: 7 meters
Est. max. hip height
: 2 meters
Est. max. weight
: 700 Kg
• C-C. Young (1940) "Preliminary notes on the Lufeng vertebrate fossils". Bulletin of the Geological Society of China 20(3-4):235-239
• C-C. Young (1942) "Yunnanosaurus huangi
Young (gen. et sp. nov.), a new Prosauropoda from the red beds at Lufeng, Yunnan".
• C-C. Young (1951) "The Lufeng saurischian fauna from China".
• Lu Junchang; Li Tianguang; Zhong Shimin; Azuma Yoichi; Fujita Masato; Dong Zhiming; Ji Qiang (2007) "New yunnanosaurid dinosaur (Dinosauria, Prosauropoda) from the Middle Jurassic Zhanghe Formation of Yuanmou, Yunnan Province of China
• P.M. Barrett, P. Upchurch, X-D. Zhou and X-L. Wang (2007) "The skull of Yunnanosaurus huangi
Young, 1942 (Dinosauria: Prosauropoda) from the Lower Lufeng Formation (Lower Jurassic) of Yunnan, China".
• T. Sekiya, X-S. Jin, W-J. Zheng, M. Shibata and Y. Azuma (2013) "A new juvenile specimen of Yunnanosaurus robustus
(Dinosauria: Sauropodomorpha) from Early to Middle Jurassic of Chuxiong Autonomous Prefecture, Yunnan Province, China".
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