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Acrocanthosaurus atokensis

Reptilia - 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.

Synonymy list
YearName and author
1950Acrocanthosaurus atokensis Stovall and Langston, Jr. p. 700 figs. 2-4, Pl.1-3
1970Acrocanthosaurus atokensis Steel p. 38
1970Acrocanthosaurus atokensis Swinton p. 143
1974Acrocanthosaurus atokensis Langston p. 84
1979Acrocanthosaurus atokensis Langston p. 42
1980Acrocanthosaurus atokensis Molnar and Pledge p. 286
1984Acrocanthosaurus atokensis Taquet p. 217
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 Harris p. 7–8
1998Acrocanthosaurus atokensis Lipka p. 231
1999Acrocanthosaurus atokensis Novas et al. p. 17R
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 D'Emic et al. p. 15
2012Acrocanthosaurus atokensis Paulina Carabajal and Currie p. 86
2012Acrocanthosaurus atokensis White et al. p. 5
2013Acrocanthosaurus atokensis Shell and Boss p. 1
2014Acrocanthosaurus atokensis Dalman p. 161
2014Acrocanthosaurus atokensis Hendrickx and Mateus p. 20
2014Acrocanthosaurus atokensis Xing et al. p. 1653
2015Acrocanthosaurus atokensis Adams p. 8
2015Acrocanthosaurus atokensis White et al. p. 3
2016Acrocanthosaurus atokensis Chiarenza and Cau p. 8
2019Acrocanthosaurus atokensis Andrzejewski et al. p. 2
2019Acrocanthosaurus atokensis Senter and Sullivan p. 2
2021Acrocanthosaurus atokensis Bandeira et al. p. 15
2021Acrocanthosaurus atokensis Suarez et al.
2023Acrocanthosaurus atokensis Carrano p. 4

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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()
Theropoda()
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.

Acrocanthosaurus atokensis Stovall and Langston, Jr. 1950
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Diagnosis
ReferenceDiagnosis
J. W. Stovall and W. Langston 1950This animal is a carnivorous saurischian of gigantic size and heavy proportions with massive and greatly elongated neural processes. The skull is of massive proportions, and the arcades are moderately heavy; orbits and postoribtal fenestra somewhat reduced; jugular foramen greatly enlarged; frontals and parietals solidly coosified and quadratosquamosal movement somewhat reduced; cervical centra opisthocoelous and of moderate length; pleurocentral cavities deep and well marginated; anterior dorsals distinctly opisthocoelous; medial caudals with supplementary neural processes; chevrons closed proximally by transverse bar, and exhibiting an anterior upward projecting process on each ramus; pelvic elements not coossified; pubis slender with broadly expanded distal termination; ischium straight, slender and elongate, somewhat expanded distally; tibia strongly bowed outward; metatarsal III somewhat constricted proximally by lateral elements.
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).
Measurements
partNmeanminimummaximummedians.d.
coracoid height1210.0----
femur circumference2406.1388.0425.0406.526.2

Composition: hydroxyapatiteo
Entire body: yesg
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: solitaryo
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: carnivoreo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-08-24 13:09:11
Modified: 2005-08-24 15:09:11
Source: g = genus, o = order
References: Peczkis 1995, Marsh 1875

Age range: base of the Late/Upper Aptian to the top of the Albian or 122.46000 to 100.50000 Ma

Collections (8 total)


Time interval Ma Country or state Original ID and collection number
Aptian125.0 - 113.0USA (Oklahoma) Acrocanthosaurus atokensis (25147 25148 type locality: 25149)
Late/Upper Aptian122.46 - 112.03USA (Texas) Acrocanthosaurus atokensis (51709)
Late/Upper Aptian122.46 - 112.03USA (Maryland) Acrocanthosaurus atokensis (14376)
Albian113.0 - 100.5USA (Arkansas) Theropoda indet. (222851)
Middle Albian - Early/Lower Cenomanian109.0 - 93.5USA (Wyoming) Acrocanthosaurus atokensis (50496) Theropoda indet. (50498)