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Acrocanthosaurus atokensis

Reptilia - Avetheropoda - Carcharodontosauridae

Taxonomy
Acrocanthosaurus atokensis was named by Stovall and Langston (1950). Its type specimen is OMNH 10146 (= MUO 8-0-S9), a partial skeleton, and it is a 3D body fossil. Its type locality is Cochran farm, OMNH V68, which is in an Aptian terrestrial shale in the Antlers Formation of Oklahoma. It was considered monophyletic by Currie and Carpenter (2000).

Synonymy list
YearName and author
1950Acrocanthosaurus atokensis Stovall and Langston, Jr. p. 686
1970Acrocanthosaurus atokensis Steel p. 38
1970Acrocanthosaurus atokensis Swinton p. 143
1974Acrocanthosaurus atokensis Langston p. 84
1980Acrocanthosaurus atokensis Molnar and Pledge p. 286
1986Acrocanthosaurus atokensis Gauthier p. 9
1988Acrocanthosaurus atokensis Paul p. 315
1990Acrocanthosaurus atokensis Molnar et al. p. 189
1996Acrocanthosaurus atokensis Buffetaut et al. p. 691
1997Acrocanthosaurus atokensis Vickaryous and Ryan p. 488
1998Acrocanthosaurus atokensis Lipka p. 231
2000Acrocanthosaurus atokensis Currie and Carpenter p. 210 figs. 1-14
2001Acrocanthosaurus atokensis Farlow p. 409
2003Acrocanthosaurus atokensis Rauhut p. 36
2004Acrocanthosaurus atokensis Holtz, Jr. et al. p. 75
2005Acrocanthosaurus atokensis Suñer et al. p. 98
2005Acrocanthosaurus atokensis Yates p. 114
2006Acrocanthosaurus atokensis Malkani p. 8
2006Acrocanthosaurus atokensis Weishampel p. 144
2007Acrocanthosaurus atokensis Gishlick and Gauthier p. 577
2007Acrocanthosaurus atokensis Sampson and Witmer p. 33
2009Acrocanthosaurus atokensis Norell et al. p. 49
2009Acrocanthosaurus atokensis Parsons and Parsons p. 721
2010Acrocanthosaurus atokensis Paulina Carabajal and Canale p. 249
2012Acrocanthosaurus atokensis Carrano et al. p. 222
2012Acrocanthosaurus atokensis Paulina Carabajal and Currie p. 86
2015Acrocanthosaurus atokensis White et al. p. 3

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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()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
superfamilyAllosauroidea
familyCarcharodontosauridae
genusAcrocanthosaurus
speciesatokensis

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
P. J. Currie and K. Carpenter 2000Large theropod with elongate neural spines that are more than 2.5 times corresponding presacral, sacral and proximal caudal lengths of the centra. Lacrimal contacts postorbital; supraoccipital expands on either side of the midline to protrude as a double boss behind the nuchal crest; pleurocoelous fossae and foramina pronounced on all presacral and sacral vertebrae; cervical neural spines have triangular anterior processes that insert into depressions beneath overhanging processes on preceding neural spines; accessory transverse processes on mid-caudal vertebrae.
M. T. Carrano et al. 2012Allosauroid theropod with: (1) absence of nasal extension of antorbital fossa and associated pneumatopores; (2) supraoccipital expanded parasagittally into double boss posterior to nuchal crest (Currie & Carpenter 2000); (3) cervical vertebral neural spines with triangular anterior processes that insert into fossae ventral to overhanging processes on preceding neural spines (Harris 1998a); (4) neural spines of presacral, sacral and anterior caudal vertebrae more than 2.5 times taller than respective centrum lengths (Stovall & Langston 1950); and (5) accessory process on lateral surface of caudal prezygapophysis (Stovall & Langston 1950).