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Mamenchisaurus sinocanadorum
Taxonomy
Mamenchisaurus sinocanadorum was named by Russell and Zheng (1994). Its type specimen is IVPP V10603, a partial skeleton (Cranial remains & cervical vertebrae), and it is a 3D body fossil. Its type locality is east of Qitai-Ertai road (SCDP), which is in an Oxfordian coarse channel fill sandstone/siltstone in the Shishugou Formation of China.
Entered
by M. Carrano on 2004-02-04; modified by P. Mannion on 2023-03-15
Synonymy list
| Year | Name and author |
|---|---|
| 1994 | Mamenchisaurus sinocanadorum Russell and Zheng |
| 1997 | Mamenchisaurus sinocanadorum Azuma and Tomida p. 375 |
| 1997 | Mamenchisaurus sinocanadorum Currie p. 661 |
| 1997 | Mamenchisaurus sinocanadorum Dong p. 122 |
| 1999 | Mamenchisaurus sinocanadorum Martin-Rolland p. 307 |
| 2001 | Mamenchisaurus sinocanadorum Dong p. 98 |
| 2002 | Mamenchisaurus sinocanadorum Ouyang and Ye pp. 98-99 |
| 2004 | Mamenchisaurus sinocanadorum Upchurch et al. p. 262 |
| 2008 | Mamenchisaurus sinocanadorum Lü et al. p. 18 |
| 2009 | Mamenchisaurus sinocanadorum Xing et al. p. 1031 |
| 2011 | Mamenchisaurus sinocanadorum Saegusa and Tomida p. 253 |
| 2019 | Mamenchisaurus sinocanadorum Maisch and Matzke p. 111 |
| 2020 | Mamenchisaurus sinocanadorum Xing et al. |
| 2023 | Mamenchisaurus sinocanadorum Moore et al. |
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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 sinocanadorum Russell and Zheng 1994
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. J. Moore et al. 2023 | Mamenchisaurus sinocanadorum can be distinguished from other known sauropods by the following autapomorphies: (1) exceptionally elongate external mandibular fenestra (length:height ratio in lateral view 1⁄4 3.7); (2) ventral surface of the axis possesses a deep, trough-like depression that contains several pneumatic foramina anteriorly; and (3) large, irregularly developed, paramedian pneumatic foramina that are flush with the surrounding ventral surface of cervical vertebra 3. In addition, M. sinocanadorum exhibits the following unique combination of character states: (1) parallel-sided tooth crowns in labial view; (2) a distolingual boss on some of the dentary teeth; (3) an anterior surangular foramen at least twice as large in its greatest diameter as the posterior surangular foramen; and (4) an essentially straight axial SPOL combined with a relatively low neural spine (neural spine:neural arch height ratio <0.45). |