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Nanotyrannus lancensis

Reptilia - Avetheropoda - Tyrannosauridae

Taxonomy
Gorgosaurus lancensis was named by Gilmore (1946). Its type specimen is CMNH 7541, a skull, and it is a 3D body fossil. Its type locality is Sand Creek, Carter County (CMNH 7541), which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.

It was recombined as Albertosaurus lancensis by Russell (1970), Kurzanov (1976), Molnar (1978), Molnar (1980), Gauthier (1986), Paul (1988) and Carpenter (1992); it was synonymized subjectively with Tyrannosaurus rex by Carr (1999), Holtz (2001), Rauhut (2003) and Carr and Williamson (2004); it was recombined as Nanotyrannus lancensis by Bakker et al. (1988), Molnar et al. (1990), Molnar (1991), Currie (1992), Currie et al. (2003), Currie (2003), Holtz (2004) and DePalma et al. (2015).

Synonymy list
YearName and author
1946Gorgosaurus lancensis Gilmore p. 2 figs. Pl. 1-4
1970Albertosaurus lancensis Russell p. 20
1970Gorgosaurus lancensis Steel p. 41
1970Gorgosaurus lancensis Tabrum p. 6
1976Albertosaurus lancensis Kurzanov
1976Gorgosaurus lancensis Sloan p. 145
1978Albertosaurus lancensis Molnar p. 73
1980Albertosaurus lancensis Molnar pp. 102-103
1986Albertosaurus lancensis Gauthier p. 9
1988Nanotyrannus lancensis Bakker et al.
1988Albertosaurus lancensis Paul p. 336
1990Nanotyrannus lancensis Molnar et al. p. 190
1991Nanotyrannus lancensis Molnar p. 167
1992Albertosaurus lancensis Carpenter p. 258
1992Nanotyrannus lancensis Currie p. 246
2003Nanotyrannus lancensis Currie
2003Nanotyrannus lancensis Currie et al. p. 231
2004Nanotyrannus lancensis Holtz, Jr. p. 113
2006Nanotyrannus lencensis Malkani p. 8
2015Nanotyrannus lancensis DePalma et al. p. 12

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
suborderCoelurosauria
superfamilyTyrannosauroidea
familyTyrannosauridae
subfamilyTyrannosaurinae
genusNanotyrannus
specieslancensis()

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
K. Carpenter 1992(Cranial) Skull long and low; maxillary fenestra small and separated from antorbital fenestra by a wide bar of the maxillary; antorbital fenestra longer than tall; nasals do not form a wedge between the frontals as in A. libratus and A. sarcophagus; in dorsal view, muzzle well differentiated from cranium so that there was stereoscopic vision. )Postcranial) fourth trochanter more proximal than in A. libratus; proximal articular face of tibia almost triangular, rather than quadrangular as in most tyrannosaurids (except for Maleevosaurus); proximal expansion of fibula is symmetrical relative to long axis of the shaft.