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Allosaurus anax

Reptilia

Taxonomy
Allosaurus anax was named by Danison et al. (2024). Its type specimen is OMNH 1771, a partial skull (postorbital), and it is a 3D body fossil. Its type locality is Stovall's Pit 1, Kenton (OMNH V92), which is in a Kimmeridgian/Tithonian wet floodplain mudstone/sandstone in the Morrison Formation of Oklahoma.

Synonymy list
YearName and author
2024Allosaurus anax Danison et al. pp. 82-83

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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
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Theropoda()
—Neotheropoda
—AverostraPaul 2002
—Tetanurae
superfamilyAllosauroidea
genusAllosaurus
speciesanax

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.

†Allosaurus anax Danison et al. 2024
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Diagnosis
ReferenceDiagnosis
A. Danison et al. 2024A species of Allosaurus capable of attaining a much larger size than other species of Allosaurus, displaying no rugose cranial ornamentation on the lateral surface of the postorbital, an absent or significantly reduced dorsolateral ridge of the postorbital, and an absent or extremely shallow lateral fossa on the posterior bar of the postorbital, hourglass-shaped dorsal centra with pneumatic foramina, and three shallow fossae on the medial surface of the proximal fibula. We tentatively consider a thickened bulge on the posterior border of the ventral bar of the postorbital and nearly vertical postzygapophyses on some cervical vertebrae to represent autapomorphies as well.
Measurements
No measurements are available
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 13:09:28
Modified: 2005-08-24 15:09:28
Source: g = genus, o = order
References: Marsh 1875, Peczkis 1995

Age range: base of the Late/Upper Kimmeridgian to the top of the Tithonian or 152.21000 to 143.10000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Late/Upper Kimmeridgian - Tithonian152.21 - 143.1USA (Oklahoma) Allosaurus anax (type locality: 49338)