Yunnanosaurus ‭(‬Yunnan Province‭)

Short Info

Yunnanosaurus ‭(‬Yunnan Province‭)

Phonetic : Yun-nan-o-sore-us.

Named By : C.‭ ‬C.‭ ‬Young‭ (‬Yang Zhongjian‭) ‬-‭ ‬1942

Diet : Herbivore

Size : Estimated 7 meters long

Type of Dinosaur : Sauropod

Type Species : Y.‭ ‬huangi‭ (‬type‭)‬,‭ ‬Y.‭ ‬youngi

Found in : China

When it Lived : Early Jurassic, 205-190 million years ago

Yunnanosaurus (/,ju:naenoU’so:r@s/ YOO-nano-SAWR-@s) has been declared an extinct sauropodomorph dinosaur that lived between 200 up to 168 million years ago, in what is now Yunnan Province, in China and was so named. Yunnanosaurus was a massive moderately built, ground-dwelling quadrupedal herbivore. It could also walk on two legs, and was seven metres (23 feet) long and 2 meters (6.5 feet) high up to 4 meters (13 feet) tall in the highest species.


Yunnanosaurus-Tianjin Natural History MuseumJonathan Chen, CC BY-SA 4.0, via Wikimedia Commons


Yang Zhongjian (also known as C. C. Young) discovered the first Yunnanosaurus Skeletons in what was previously known as to be the Lufeng Formation of Yunnan, China. The fossil found consisted of over 20 skeletons in a state of incompleteness comprising two skulls, they were excavated through Tsun Yang. When it was first discovered, Yunnanosaurus was considered to be closely similar to Lufengosaurus However, newer research conducted from Novas et al. (2011) suggests that it is the most closely with Anchisaurus along with Jingshanosaurus.

The Yunnanosaurus species of youngi was found in the Banqing Houshanliangzi location in the Zhanghe Formation, in Yuanmou County of Yunnan Province, China. The holotype specimen, CXMVZA 185 was discovered in 2000 in sediments of the terrestrial layer that were deposited in the Aalenian and Bajocian stage in the Middle Jurassic period, approximately between 174 and 168 million years in the past. The specimen is part of collections of Chuxiong Museum. Chuxiong Museum.

In 2007 Lu Junchang and colleagues described another type from Yunnanosaurus, Y. youngi (named in the honor the memory of C. C. Young). Apart from differences in the skeleton and measurements of 13 meters (42 feet) in length, Y. youngi was significantly bigger than Y. Huangi (which measured just 7 meters [23 feet]). Y. youngi is found later in the fossil record, originating in it’s Middle Jurassic. The Holotype specimen CXMVZA 185 is comprised from ten cervical vertebrae 14 dorsal vertebrae sacral vertebrae that have been fused, seventeen caudal vertebrae, two pubic bone, the ischia as well as the right illium. This species’ skull isn’t well-known.

In 2013, Sekiya et al. revealed the existence of a young person that was assigned to what authors called Yunnanosaurus robustus. ZMNH-M8739 is a part of the cranial material as well as an almost complete post-cranial skull. This particular specimen is characterized by a distinct dentition which suggests a unique feeding mechanism as shown by teeth-tooth wear in its maxillary mesial as well as maxillary teeth with sharp serrations. Comparing the juvenile specimen to adult specimens from Yunnanosaurus Huangi shows very distinct changes in growth.

In 2021, the location that the specimens came from were re-examined The specimens are now believed to be in the Fengjiahe Formation which dates back up to Pliensbachian.

Source: Wikipedia