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Amtosaurus

Reptilia -

Taxonomy
Amtosaurus was named by Kurzanov and Tumanova (1978). Its type is Amtosaurus magnus. It was considered monophyletic by Vickaryous et al. (2004).

It was considered a nomen dubium by Carpenter (2001); it was considered a nomen dubium by Parish and Barrett (2004).

It was assigned to Ankylosaurinae by Tumanova (1987); to Syrmosaurinae by Ford (2000); to Ankylosauridae by Carroll (1988), Barsbold (1997), Tumanova (2000) and Averianov (2002); and to Ankylosauria by Kurzanov and Tumanova (1978) and Vickaryous et al. (2004).

Synonymy list
YearName and author
1978Amtosaurus Kurzanov and Tumanova p. 371 fig. 2
1987Amtosaurus Tumanova
1988Amtosaurus Carroll
1997Amtosaurus Barsbold p. 450
2000Amtosaurus Ford p. 176
2000Amtosaurus Tumanova p. 522
2002Amtosaurus Averianov
2004Amtosaurus Vickaryous et al. p. 367

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Genasauria
Thyreophora()
Ankylosauria()
genusAmtosaurus

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.

Diagnosis
ReferenceDiagnosis
S. M. Kurzanov and T. A. Tumanova 1978Occiput and brain case high. Occipital condyle appearing as a narrow oval. On the surface between the condyle and the sphenoccipital protuberances there are two longitudinal, gently sloping elevations that are symmetric relative to the median depression. The floor of the brain case is slightly inflected in the anterior part. The dorsum sellae has a triangular process to the side of the pituitary fossa on the contunuation of the basis trabeculi basalis. The fenestra ovalis lies considerably above the jugular fenestra. The outlets of nerve XII are on the same level.
T. A. Tumanova 1987Occipital condyle a narrow oval and inclined posteroventrally; basioccipital with two elongated, sloping basitubera distributed symmetrically with respect to the ventromedial depression; floor of braincase with few flexions in anterior section; foramen in endocranium large; fenestra ovalis not joined with jugular foramen.