Mamenchisaurinae

Mamenchisauridae Temporal range: Early-Late Jurassic, Pliensbachian–Oxfordian PreЄ Є O S D C P T J K Pg N
Mamenchisaurus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	Saurischia
Suborder:	†Sauropodomorpha
Clade:	†Sauropoda
Clade:	†Eusauropoda
Family:	†Mamenchisauridae Young and Zhao, 1972
Genera
†Datousaurus? †Eomamenchisaurus †Huangshanlong †Hudiesaurus †Mamenchisaurus †Omeisaurus †Qijianglong †Tienshanosaurus †Tonganosaurus †Xinjiangtitan †Yuanmousaurus †Zigongosaurus
Synonyms
Omeisauridae Wilson, 2002

Omeisauridae Wilson, 2002

Mamenchisauridae is a family of sauropod dinosaurs. The family was first named by Chinese paleontologists C.C. Young and X. Zhao in 1972, in a paper describing Mamenchisaurus. Other mamenchisaurids may include Chuanjiesaurus, Datousaurus, Eomamenchisaurus, Huangshanlong, Hudiesaurus, Qijianglong, Tienshanosaurus, Omeisaurus, and Tonganosaurus, Xinjiangtitan, Yuanmousaurus, Zigongosaurus . Fossils of Mamenchisaurus and Omeisaurus have been found in the Shangshaximiao Formation, dating to the Oxfordian stage, around 161.2-157.3 Ma (million years ago). Chuanjiesaurus fossils date between 175.6-161.2 Ma, while those of Eomamenchisaurus were found in the Zhanghe Formation, believed to be around 175.6-161.2 million years old. Fossils of Tonganosaurus date to even earlier, from the (Pliensbachian) Early Jurassic.

Long-bone histology enables researchers to estimate the age that a specific individual reached. A study by Griebeler et al. (2013) examined long bone histological data and concluded that the unnamed mamenchisaurid SGP 2006/9 weighed 25,075 kilograms (27.6 short tons), reached sexual maturity at 20 years and died at age 31.