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Mongolosaurus haplodon

Reptilia

Taxonomy
Mongolosaurus haplodon was named by Gilmore (1933). Its type specimen is AMNH 6710, a partial skeleton, and it is a 3D body fossil. Its type locality is Hu Khung Ulan (AMNH quarry 714), which is in an Aptian/Albian terrestrial siliciclastic in the On Gong Formation of China.

It was considered a nomen dubium by Dong (1992); it was misspelled as Mongolosaurus hoplodon by Dong (1994), Wilson (2002) and Buffetaut et al. (2002); it was considered a nomen dubium by Barrett et al. (2002) and Upchurch et al. (2004); it was considered a nomen dubium by Buffetaut et al. (2006).

Synonymy list
YearName and author
1933Mongolosaurus haplodon Gilmore p. 11 figs. 4-11
1935Mongolosaurus haplodon Young
1937Mongolosaurus hoplodon Young p. 21
1939Mongolosaurus haplodon Kuhn p. 112
1939Mongolosaurus haplodon Riabinin p. 6
1958Mongolosaurus hoplodon Young p. 24
1964Mongolosaurus haplodon Tatarinov p. 545
1970Mongolosaurus haplodon Steel p. 82
1980Mongolisaurus hoplodon Chao
1986Mongolosaurus hoplodon Zhao p. 68
1990Mongolosaurus haplodon McIntosh p. 398
1994Mongolosaurus hoplodon Dong p. 2098
2002Mongolosaurus haplodon Buffetaut et al. p. 97
2002Mongolosaurus haplodon Wilson p. 249
2006Mongolosaurus haplodon Wilson p. 171
2007Mongolosaurus haplodon Barrett and Wang p. 268
2011Mongolosaurus haplodon Díez Díaz et al. p. 522
2011Mongolosaurus haplodon Mannion
2012Mongolosaurus haplodon D'Emic
2012Mongolosaurus haplodon Díez Díaz et al. p. 266
2023Mongolosaurus haplodon Tatehata et al. p. 355

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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
RankNameAuthor
subclassEureptilia()
Romeriida
Diapsida()
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Sauropoda()
Titanosauria
genusMongolosaurus
specieshaplodon

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.

Mongolosaurus haplodon Gilmore 1933
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Diagnosis
ReferenceDiagnosis
P. D. Mannion 2011Mongolosaurus can be diagnosed on the basis of several autapomorphies (marked with an ∗), as well as a unique combination of characters not seen in other sauropods: ventral surface of the atlantal intercentrum is anteroposteriorly longer than the dorsal surface, forming an anteroventral projection (also present in flagellicaudatans but not in other titanosauriforms, except very weakly in Futalognkosaurus and Rapetosaurus); dorsal edges of the posterior articular surfaces of anterior cervical centra project more posteriorly than the ventral edges∗; postaxial cervical parapophyses excavated ventrally∗; hypertrophied epipophyses on postaxial cervical postzygapophyses (also present in Erketu); midline keel present on ventral surface of axis (also present in non-titanosaurs and Futalognkosaurus) and postaxial anterior cervical vertebrae (also present in non-titanosaurs and Gondwanatitan); cervical neural spine does not extend beyond the height of the epipophyses∗; postaxial spinoprezygapophyseal laminae form a dorsoventrally elongate X-shape in anterior view∗; dorsal half of the spinoprezygapophyseal laminae aligned nearly horizontally∗; near-horizontally aligned, lateromedially oriented spinopostzygapophyseal laminae∗; cervical vertebra 3 neural spine distally bifurcated (also present in flagellicaudatans and Camarasaurus).
Measurements
No measurements are available
Composition: hydroxyapatiteinfrao
Entire body: yesinfrao
Adult length: 10 to < 100infrao
Adult width: 10 to < 100infrao
Adult height: 10 to < 100infrao
Thickness: thickinfrao
Architecture: compact or denseinfrao
Form: sphericalinfrao
Ontogeny: accretion, modification of partsinfrao
Grouping: gregariousinfrao
Environment: terrestrialinfrao
Locomotion: actively mobileinfrao
Life habit: ground dwellinginfrao
Diet: herbivoreinfrao
Reproduction: oviparousinfrao
Dispersal: direct/internalinfrao
Dispersal 2: mobileinfrao
Created: 2004-12-14 12:49:10
Modified: 2004-12-14 14:49:10
Source: infrao = infraorder
Reference: Marsh 1875

Age range: base of the Aptian to the top of the Albian or 125.00000 to 100.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Aptian - Albian125.0 - 100.5China (Nei Mongol) Sauropoda indet. (type locality: 48930)