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Mamenchisaurus youngi
Taxonomy
Mamenchisaurus youngi was named by Pi et al. (1996). It is not extant. Its type specimen is ZDM 0083. Its type locality is Jiujingba, Xinming, which is in a Bathonian/Callovian terrestrial horizon in the Shaximiao Formation of China.
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Mamenchisaurus youngi Pi et al. |
| 2002 | Mamenchisaurus youngi Ouyang and Ye p. 91 |
| 2004 | Mamenchisaurus youngi Upchurch et al. p. 263 |
| 2005 | Mamenchisaurus youngi Peng et al. |
| 2006 | Mamenchisaurus youngi Royo-Torres et al. fig. S4 |
| 2007 | Mamenchisaurus youngi Läng and Goussard p. 556 |
| 2008 | Mamenchisaurus youngi Lü et al. p. 18 |
| 2008 | Mamenchisaurus youngi Xing et al. p. 1050 |
| 2009 | Mamenchisaurus youngi Xing et al. p. 1394 |
| 2009 | Mamenchisaurus youngi Xing et al. p. 1031 |
| 2010 | Mamenchisaurus youngi Barrett et al. p. 117 |
| 2010 | Mamenchisaurus youngi Saegusa et al. p. 56 |
| 2011 | Mamenchisaurus youngi Li et al. p. 24 |
| 2011 | Mamenchisaurus youngi Saegusa and Tomida p. 253 |
| 2012 | Mamenchisaurus youngi Royo-Torres and Upchurch p. 561 |
| 2019 | Mamenchisaurus youngi Maisch and Matzke p. 111 |
| 2019 | Mamenchisaurus youngi Tan et al. p. 110 |
| 2021 | Mamenchisaurus youngi Holwerda et al. p. 630 |
| 2021 | Mamenchisaurus youngi Ren et al. p. 1875 |
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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 youngi Pi et al. 1996
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Peng et al. 2005 | Medium-sized mamenchisaurid about 16 m of body length. It is recognized by a very light-built skull with large external openings and a V-shaped dorsal view; external naris dorsolaterally situated in mid-skull; pear-shaped orbit and triangular antorbital; length of infratemporal fenestra equals to its height; posterior cranial roof inclined backward; quadrate extending anteroventrally; large maxilla and premaxilla forming relatively broad facial region; lachrymal, postorbital and quadratojugal slender; occipital ridge of supraoccipital well developed; long dentary with a remarkable droopy anterior end; external mandibular foramen slightly posteriorly positioned; long dentary dentition containing much more teeth; dental formula Pm4 + M18 / D23~24; spoon-shaped teeth with slender crowns; tooth crown with prominent wear facet; serrations of anterior margin more than posterior margin in unworn teeth; 18 cervicals, 12 dorsals, 5 sacrals and more than 50 caudals; opisthocoelous presacral centra with developed cellular structures but simple laminar structures; neural spines of posterior cervicals and anterior dorsals slightly bifurcated; longest cervical centrum 2.5 times of length of longest dorsal centrum; cervical centra with undeveloped pleurocoel and lacking ventral keel; extremely slender cervical ribs; middle cervical ribs with a forked anterior process; dorsal centra with a slightly developed pleurocoel; all sacral centra and first four sacral neural spines co-ossified; anterior caudals strongly precoelous and distal caudals amphiplatyan; long and broad scapula; small sternum; low and elongate ilium with developed anterior process and pubic peduncle; humerus almost 72% of femur length; ulna about 69% of humerus length; tibia about 57% of femur length; small manus and pes; only manual digit I with an ungual; manual digit formula 2-2-1?-1?-1?; pedal digit I and II with unguals; and pedal digit formula 2-3-3-2?-1?. |
Measurements
No measurements are available
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| Source: g = genus, infrao = infraorder | |||||
| References: Peczkis 1995, Marsh 1875 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Bathonian - Callovian | China (Sichuan) | Mamenchisaurus youngi (type locality: 58974) |