PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Mamenchisauridae (mamenchisaurid)

Reptilia

Taxonomy

Mamenchisauridae was named by Chao (1965). It was considered monophyletic by Sekiya (2011).

It was reranked as the subfamily Mamenchisaurinae by McIntosh (1990) and McIntosh (1990); it was synonymized subjectively with Euhelopodidae by Hunt et al. (1995); it was reranked as the unranked clade Mamenchisauridae by Moore et al. (2023).

It was assigned to Diplodocidae by McIntosh (1990) and McIntosh (1990); to Mamenchisauroidea by Dong (1998); to Sauropoda by McIntosh (1997) and Tang et al. (2001); to Sauropoda by Young and Chao (1972), Dong and Tang (1984), He et al. (1988), Zhang and Chen (1996) and Ouyang and Ye (2002); and to Eusauropoda by Suteethorn et al. (2010), Sekiya (2011), Suteethorn et al. (2013), Xing et al. (2015) and Moore et al. (2023).

Synonyms

Omeisauridae was named by Wilson (2002).

It was synonymized subjectively with Mamenchisauridae by Suteethorn et al. (2013).

It was assigned to Eusauropoda by Wilson (2002) and Allain and Aquesbi (2008).

Synonymy list

Year	Name and author
1965	Mamenchisauridae Chao p. 36
1972	Mamenchisauridae Young and Chao p. 2
1984	Mamenchisauridae Dong and Tang
1988	Mamenchisauridae He et al. p. 6
1990	Mamenchisaurinae McIntosh p. 56
1996	Mamenchisauridae Zhang and Chen
1997	Mamenchisauridae McIntosh p. 657
1998	Mamenchisauridae Dong p. 84
2001	Mamenchisauridae Tang et al. p. 14
2002	Mamenchisauridae Ouyang and Ye p. 90
2002	Omeisauridae Wilson p. 240 fig. 13
2008	Omeisauridae Allain and Aquesbi p. 403
2010	Mamenchisauridae Suteethorn et al.
2011	Mamenchisauridae Sekiya
2013	Mamenchisauridae Suteethorn et al. p. 461
2015	Mamenchisauridae Xing et al.
2023	Mamenchisauridae Moore et al.

Is something missing? Join the Paleobiology Database and enter the data

Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia

Rank	Name	Author
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Saurischia	()
—	Sauropoda	()
—	Gravisauria
—	Eusauropoda
—	Mamenchisauridae	()
—	Mamenchisauridae	()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Unr. †Mamenchisauridae Chao 1965 [mamenchisaurid]

show all | hide all

G. †Abrosaurus Ouyang 1989

†Abrosaurus dongpoensis Ouyang 1989

G. †Analong Ren et al. 2021

†Analong chuanjieensis Ren et al. 2021

G. †Anhuilong Ren et al. 2018

†Anhuilong diboensis Ren et al. 2018

G. †Bellusaurus Dong 1990

†Bellusaurus sui Dong 1990

G. †Chuanjiesaurus Fang et al. 2000

†Chuanjiesaurus anaensis Fang et al. 2000

G. †Daanosaurus Ye et al. 2005

†Daanosaurus zhangi Ye et al. 2005

G. †Eomamenchisaurus Lü et al. 2008

†Eomamenchisaurus yuanmouensis Lü et al. 2008

G. †Huangshanlong Huang et al. 2014

†Huangshanlong anhuiensis Huang et al. 2014

G. †Hudiesaurus Dong 1997

†Hudiesaurus sinojapanorum Dong 1997

G. †Jingia Ren et al. 2024

†Jingia dongxingensis Ren et al. 2024

G. †Klamelisaurus Zhao 1993

†Klamelisaurus gobiensis Zhao 1993

G. †Mamenchisaurus Young 1954

†Mamenchisaurus anyuensis He et al. 1996

†Mamenchisaurus constructus Young 1954

†Mamenchisaurus gongjianensis

†Mamenchisaurus hochuanensis Chao 1965

†Mamenchisaurus jingyanensis Zhang et al. 1998

†Mamenchisaurus sinocanadorum Russell and Zheng 1994

†Mamenchisaurus youngi Pi et al. 1996

G. †Omeisaurus Young 1939

†Omeisaurus changshouensis Young 1958

†Omeisaurus fuxiensis Dong et al. 1983

†Omeisaurus jiaoi Jiang et al. 2011

†Omeisaurus junghsiensis Young 1939

†Omeisaurus luoquanensis Li 1988

†Omeisaurus maoianus Tang et al. 2001

†Omeisaurus puxiani Tan et al. 2020

†Omeisaurus tianfuensis He et al. 1984

G. †Qijianglong Xing et al. 2015

†Qijianglong guokr Xing et al. 2015

G. †Rhomaleopakhus Upchurch et al. 2021

†Rhomaleopakhus turpanensis Upchurch et al. 2021

G. †Tienshanosaurus Young 1937

Invalid names: Tienshanosaurus chitaiensis Young 1937 [nomen dubium]

G. †Tonganosaurus Li et al. 2010

†Tonganosaurus hei Li et al. 2010

G. †Wamweracaudia Mannion et al. 2019

†Wamweracaudia keranjei Mannion et al. 2019

G. †Xinjiangtitan Wu et al. 2013

†Xinjiangtitan shanshanesis Wu et al. 2013

G. †Yuanmousaurus Lü et al. 2006

†Yuanmousaurus jiangyiensis Lü et al. 2006

G. †Zigongosaurus Hou et al. 1976

Invalid names: Omeisauridae Wilson 2002 [synonym]

Diagnosis

Reference	Diagnosis
C.-C. Young and H. C. Chao 1972	Extremely long cervical region (19 vertebrae); dorsal, sacral, and caudal vertebrae short and few in number (4 sacral vertebrae); massive and long cervical ribs; pleurocoels not well developed on dorsal vertebrae; anterior dorsal vertebrae with bifid neural spine; medial caudal vertebrae with bifurcated haemal spines; anterior caudal vertebrae procoelous; centrally positioned pubic peduncle on ilium.
S. Suteethorn et al. 2013	Posterior cervical vertebrae of mamenchisaurids can be diagnosed by their bifid neural spine with a U−shaped cleft and no median tubercle; the centrum and neural spine are entirely filled with numerous small pneumatic camellae (cancellous inner structure); the centra show large pleurocoels with successive generations of smaller chambers.