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Omeisaurus tianfuensis

Reptilia

Taxonomy
Omeisaurus tianfuensis was named by He et al. (1984). Its type specimen is ZDM T7501, a skeleton, and it is a 3D body fossil. Its type locality is Dashanpu Dinosaur Quarry [lower], which is in a Bajocian/Oxfordian lacustrine sandstone/mudstone in the Shaximiao Formation of China.

Synonymy list
YearName and author
1984Omeisaurus tianfuensis He et al. p. 14 figs. 1-11; Pl. 1-4
1988Omeisaurus tianfuensis He et al. p. 6
1990Omeisaurus tianfuensis McIntosh p. 380
1992Omeisaurus tianfuensis Dong p. 61
1993Omeisaurus tianfuensis Buffetaut et al. p. 56
1994Omeisaurus tianfuensis Russell and Zheng p. 2089
1996Omeisaurus tianfuensis Zhang and Chen
1997Omeisaurus tianfuensis Dong p. 121
1997Omeisaurus tianfuensis Vickaryous and Ryan p. 489
1998Omeisaurus tianfuensis Dong p. 81
1998Omeisaurus tianfuensis Wilson and Sereno p. 15
1999Omeisaurus tianfuensis Martin-Rolland pp. 295-297
2004Omeisaurus tianfuensis Upchurch et al. p. 262
2005Omeisaurus tianfuensis Apesteguía p. 249
2005Omeisaurus tianfuensis Peng et al.
2005Omeisaurus tianfuensis Salgado and Coria p. 434
2006Omeisaurus tianfuensis Buffetaut et al. p. 25
2006Omeisaurus tianfuensis Galton and Knoll p. 905
2007Omeisaurus tianfuensis Ye et al. p. 136
2010Omeisaurus tianfuensis Saegusa et al. p. 56
2011Omeisaurus tianfuensis Jiang et al. p. 188
2011Omeisaurus tianfuensis Li et al. p. 23
2011Omeisaurus tianfuensis Saegusa and Tomida p. 253
2013Omeisaurus tianfuensis Tschopp and Mateus p. 324
2019Omeisaurus tianfuensis Tan et al. p. 110
2021Omeisaurus tianfuensis Ren et al. p. 1875

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Saurischia()
—Sauropoda()
—Gravisauria
—Eusauropoda
—Mamenchisauridae()
genusOmeisaurus
speciestianfuensis

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.

†Omeisaurus tianfuensis He et al. 1984
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Diagnosis
ReferenceDiagnosis
G. Peng et al. 2005Huge-sized sauropod about 20 m of biggest body length. It recognized by skull with its height more than 1/2 of its length; larger supratemporal fenestra; relatively small antorbital fenestra; slightly posteriorly positioned naris; presence of intermaxillary foramen; high maxillary with a larger ascending process; articular surface of skull with lower jaws bellow mandibular dentition; relatively posteriorly positioned external mandibular foramen; deeper anterior end of dentary; dentary occupies 2/3 of mandible length; Pm4+M11/D13~15 dental formula; robust and spoon-shaped teeth with developed serrations on anterior margin and few or no serrations on posterior margin; 17 cervicals, 12 dorsals, 4 sacrals and more than 36 caudals; longest cervical about 3 times of length of longest dorsal; opisthocoelous cervical centra with well developed pleurocoel laterally and keel ventrally; low cervical neural spines elongated longitudinally with a straight dorsal margin; well developed laminar structures of posterior cervicals; extremely elongated cervical ribs (the longest rib about 2.5 times of length of the longest cervical centra); opisthocoelous dorsals with developed pleurocoel and not bifurcated neural spine; fused sacral centra and partially fused sacral neural spines; slightly amphicoelous anterior caudals with fan-shaped ribs on the first one; chevrons of middle caudals with bifurcated distal end; elongate oval-shaped sternum; long clavicle spear-shaped; remarkably expanded proximal end of scapula; nearly oval-shaped coracoid; ilium with robust pubic peduncle and undeveloped ischial peduncle; forelimb about 4/5 or more of length of hindlimb; ulna about 2/3 or more of humerus length; tibia about 2/3 of femur length; manual phalangeal formula 2-2-2?-2?-1?; pedal phalangeal formula 2-3-3-3-2; manual digit I and pedal digit I~III with unguals.