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Mamenchisaurus anyuensis
Taxonomy
Mamenchisaurus anyuensis was named by He et al. (1996). Its type specimen is AL 001, a skeleton, and it is a 3D body fossil. Its type locality is Matisi, Anyue, which is in a Jurassic terrestrial sandstone in the Penglaizhen Formation of China.
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Mamenchisaurus anyuensis He et al. |
| 2002 | Mamenchisaurus anyuensis Ouyang and Ye pp. 98-99 |
| 2004 | Mamenchisaurus anyuensis Upchurch et al. p. 263 |
| 2008 | Mamenchisaurus anyueensis Lü et al. p. 21 |
| 2009 | Mamenchisaurus anyuensis Xing et al. p. 1031 |
| 2011 | Mamenchisaurus anyueensis Li et al. p. 24 |
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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.
†Mamenchisaurus anyuensis He et al. 1996
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| X. He et al. 1996 | A large sauropod with a body length of approximately 21 m or more, approaching M. hochuanensis in size. Teeth are typically spoon-shaped, relatively small, maintain serrations only on the anterior margin, have conspicuous folding on the basal labial side, and a lingual medial crest is present. Cervicals exceed 17 in count, there are 12 dorsals, 5 sacrals, and an estimated 50 caudals. Presacral centra are opisthocoelous, centrum walls are extremely thin and interior centrum composition is highly pneumaticized. Cervical pleurocoels are not well developed and centra are relatively elongated, or generally similar to the condition on
M. hochuanensis. Posterior cervical and anterior dorsal neural spines are extremely weakly bifid. Dorsals all have typically well develop pleurocoels. Sacral centra are fused but not conspicuously ventrally constricted and only the first sacral centrum has extremely weak pleurocoels. Anterior caudals are procoelous, neural spines are simple in morphology, and diapophyses are not excessively developed. Medial caudals have bifurcated haemal arches and on the most posterior caudals prezygapophyses and neural spines remain present. The anteroproximal margin of the scapula is appropriately dorsally oblique, there is a conspicuous process on the posterior margin dorsal to the glenoid fossa, the coracoid is semi-elliptical and is in contact with the scapula with a relatively straight suture line. The clavicle is arched with one end narrow and bifurcated and the other end broad and flat. The humerus is approximately three-quarters the length of the femur and the ulna is two-thirds the length of the humerus. The ilium resembles the basic morphology of Omeisaurus and Mamenchisaurus, the pubic peduncle is robust and situated at the midpoint of the ilium, an ischiac peduncle is indistinct, proximal ischium is distinctly broadened, the shaft is elongated, and the distal end is thin. |
Measurements
No measurements are available
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| Source: g = genus, infrao = infraorder | |||||
| References: Marsh 1875, Peczkis 1995 | |||||
Age range: base of the Late/Upper Jurassic to the top of the Late/Upper Aptian or 161.50000 to 113.20000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Jurassic | China (Sichuan) | Mamenchisaurus anyuensis (type locality: 58976) | |
| Late/Upper Aptian | China (Sichuan) | Mamenchisaurus anyuensis (58977) |