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Arkansaurus fridayi

Reptilia

Taxonomy
Arkansaurus fridayi was named by Hunt and Quinn (2018). Its type specimen is UAM 74-16, a set of limb elements (partial right pes), and it is a 3D body fossil. Its type locality is Lockesburg (UAM), which is in an Albian marginal marine sandstone in Arkansas. It is the type species of Arkansaurus.

Synonymy list
YearName and author
2018Arkansaurus fridayi Hunt and Quinn p. 2

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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()
—Romeriida
RankNameAuthor
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Theropoda()
—Neotheropoda
—AverostraPaul 2002
—Tetanurae
—Coelurosauria()
—Maniraptoriformes
—Arctometatarsalia
infraorderOrnithomimosauria
genusArkansaurus
speciesfridayi

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.

†Arkansaurus fridayi Hunt and Quinn 2018
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Diagnosis
ReferenceDiagnosis
R. K. Hunt and J. H. Quinn 2018Ornithomimosaur with a third metatarsal that is laterally compressed proximally but that is still visible along its entire extensor surface and which possesses the following unique combination of synapomorphies: long slender metatarsus; proximal articular facets of the metatarsals ovoid in shape; pedal unguals more strongly ventrally curved distally than any other ornithomimosaur; and the distal ungual has a very weak flexor tubercle, is curved and not flat, and does not have mediolateral spurs.