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YUNNANOSAURUS

a plant-eating anchisaurian sauropodomorph dinosaur from the Early Jurassic of China.
Pronunciation: yoo-NAH-no-SOR-us
Meaning: Yunnan lizard
Author/s: C.C. Young (1940)
Synonyms: See below
First Discovery: Yunnan, China
Chart Position: 141

Yunnanosaurus huangi

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
Yunnanosaurus is derived from "Yunnan" (for Yunnan Province) and the Greek "sauros" (lizard).
The species epithet, huangi, is named for the Huangchiatien locality.
Discovery
The first fossils of Yunnanosaurus were discovered at Huangchiatien in the Zhangjiawa Member of the Lufeng Formation, Yunnan, China.
The holotype (IVPP AS V.20) is a partial skeleton missing a skull and bits of its front and hind legs.
Synonyms
Yunnanosaurus robustus (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 in 2014.
Estimations
Timeline:
Era: Mesozoic
Epoch: Early Jurassic
Stage: Hettangian-Simemurian
Age range: 201-189 mya
Stats:
Est. max. length: 7 meters
Est. max. hip height: 2 meters
Est. max. weight: 700 Kg
Diet: Herbivore
References
• 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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To cite this page:
Atkinson, L. "YUNNANOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 25th Jun 2017.
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