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Allosaurus jimmadseni

Reptilia

Taxonomy
Allosaurus jimmadseni was named by Chure et al. (2006). Its type specimen is DINO 11541, a skeleton, and it is a 3D body fossil. Its type locality is DNM 116, N.A.A. Quarry, which is in a Kimmeridgian coarse channel fill conglomerate/sandstone in the Morrison Formation of Utah.

Synonymy list
YearName and author
2006Allosaurus jimmadseni Chure et al. p. 236
2010Allosaurus jimmadseni Galiano and Albersdörfer p. 5
2010Allosaurus jimmadsoni Galiano and Albersdörfer p. 5
2012Allosaurus jimmadseni Carrano et al. p. 223
2014Allosaurus jimmadseni Cobos et al. p. 39
2014Allosaurus jimmadseni Dalman p. 161
2020Allosaurus jimmadseni Chure and Loewen pp. 8, 20–22 figs. Figures 1–16
2020Allosaurus jimmadseni Foster et al. p. 41

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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
speciesjimmadseni

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 jimmadseni Chure et al. 2006
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Diagnosis
ReferenceDiagnosis
D. J. Chure and M. A. Loewen 2020Allosaurus jimmadseni is distinguished from other basal tetanurans by the following unique combination of characters: (1) in lateral view, a row of neurovascular foramina pierce the medioventral wall of the maxillary antorbital fossa; (2) straight posteroventral jugal ramus of maxilla where it articulates with jugal; (3) laterodorsal margin of nasal “pinched” into low crest continuous from premaxilla to lacrimal; (4) posterior portion of dorsal surface of nasal cup-shaped, producing a median peak in region of nasofrontal contact; (5) relatively taller lacrimal horns than in Allosaurus fragilis; (6) jugal with relatively straight ventral margin and straight-to-slightly-curved outline in dorsal view; a well-developed distinct antarticular, and (7) axial intercentrum is rotated dorsally and has a flared rim in lateral view.