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Neimongosaurus yangi
Taxonomy
Neimongosaurus yangi was named by Zhang et al. (2001). Its type specimen is LH V0001 and is a 3D body fossil. Its type locality is Sanhangobi, Nei Monggol, which is in a Campanian/Campanian fluvial sandstone in the Iren Dabasu Formation of China. It is the type species of Neimongosaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2001 | Neimongosaurus yangi Zhang et al. p. 284 figs. Pl. 1-3 |
| 2002 | Neimongosaurus yangi Xu et al. p. 229 |
| 2004 | Neimongosaurus yangi Clark et al. p. 152 |
| 2007 | Neimongosaurus yangi Averianov p. 538 |
| 2007 | Neimongosaurus yangi Li et al. p. 545 |
| 2009 | Neimongosaurus yangi Zanno et al. p. S15 |
| 2010 | Neimongosaurus yangi Zanno p. 516–517 |
| 2012 | Neimongosaurus yangi Qian et al. p. 342 |
| 2013 | Neimongosaurus yangi Pu et al. |
| 2015 | Neimongosaurus yangi Tsuihiji et al. p. 64 |
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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.
†Neimongosaurus yangi Zhang et al. 2001
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Zanno 2010 | Zhang et al. (2001, p. 39) provided the following diagnosis for Neimongosaurus: “cranial caudal vertebrae with circular fossa under transverse process; radius with prominent biceps tuberosity; proximal pedal phalanges with well developed heels; tibia with extremely long fibular crest exceeding half total tibia length; and lateral surface of preacetabular process twisted to face dorsally; and caudal vertebrae are characterized by widely divergent prezygapophyses (distribution poorly known among other therizinosauroids)”.
Of these characters, cranial caudal vertebrae with a circular fossa under the transverse process are also found in other therizinosaurians (e.g. No. mckinleyi and No. graffami) as well as in oviraptorosaurians (e.g. Nomingia, IGM 100/119), and proximal pedal phalanges with well- developed heels occur in No. mckinleyi and No. graffami. Possession of an elongate fibular crest exceeding half the total length of the tibia (approximately 57% in Neimongosaurus) also does not significantly differ from the condition in Nothronychus (approximately 55% in No. graffami). The presence of a preacetabular process in which the lateral surface is twisted so as to face dorsally is a derived therizinosaurian feature (e.g. Nothronychus, Segnosaurus, Nanshiungosaurus brevispinus), probably the result of lateral deflection of the preacetabular portion of the ilium. Zhang et al. (2001) note that widely divergent caudal prezygapophyses are potentially diagnostic, yet the prezygapophyses of Neimongosaurus are not unusual with respect to the condition in other therizinosaurians (Zanno in press). The radius of Neimongosaurus does possess a more proximally located and pronounced biceps tubercle than is known for other therizinosaurians (e.g. Segnosaurus, Falcarius), so at present this taxonomic distinction appears to be valid. Neimongosaurus is not rediagnosed here (see Erliansaurus below). |
Measurements
No measurements are available
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| Source: superf = superfamily, o = order | |||||
| References: Kiessling 2004, Marsh 1875, Holtz et al. 2000 | |||||
Age range: base of the Middle Campanian to the top of the Late/Upper Campanian or 83.60000 to 72.20000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Campanian - Late/Upper Campanian | China (Nei Mongol) | Neimongosaurus yangi (type locality: 55713) |