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Brachychampsa montana

Reptilia - Alligatoridae

Taxonomy
Brachychampsa montana was named by Gilmore (1911). Its type specimen is AMNH-DP 5032, a partial skull (anterior two-thirds of the skull with fragments of the posterior portion), and it is a 3D body fossil. Its type locality is Southeast of Lismas, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana. It is the type species of Brachychampsa.

Synonymy list
YearName and author
1911Brachychampsa montana Gilmore p. 298 figs. Pl. 26-27
1964Brachychampsa montana Estes p. 142
1970Brachychampsa montana Estes and Berberian p. 6
1980Brachychampsa montana Carpenter and Lindsey p. 1213
1989Brachychampsa montana Bryant p. 54
1994Brachychampsa montana Norell et al. p. 4 figs. 1-6
1996Brachychampsa montana Williamson p. 422
2011Brachychampsa montana Puértolas et al.

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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()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
RankNameAuthor
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
Pseudosuchia(Zittel 1890)
SuchiaKrebs 1974
Paracrocodylomorpha
Loricata(Merrem 1820)
Crocodylomorpha()
suborderCrocodyliformes
MesoeucrocodyliaWhetstone and Whybrow 1983
NeosuchiaClark 1988
suborderEusuchiaHuxley 1875
Crocodylia(Owen 1842)
BrevirostresCuvier
superfamilyAlligatoroideaGray 1844
Globidonta
familyAlligatoridaeGray 1844
Caimaninae
genusBrachychampsa
speciesmontana

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
M. A. Norell et al. 1994Anterior end of rostrum very broad and blunt, narial aperture more than half as wide as rostrum, incisive foramen nearly half as wide as rostrum, suborbital fenestra smaller than in other alligatoroids, divided choana large, nearly excluding pterygoids from the ventral midline. Infratemporal fenestra large, nearly as large as orbit. Fifth maxillary tooth largest in the tooth row (reversal to the primitive condition for Crocodylia).