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Asylosaurus yalensis

Reptilia -

Taxonomy
Asylosaurus yalensis was named by Galton (2007). Its type specimen is YPM 2195, a set of postcrania, and it is a 3D body fossil. Its type locality is Durdham Down, Quarry Steps, which is in a Rhaetian fissure fill limestone/breccia in the Magnesian Conglomerate Formation of the United Kingdom. It is the type species of Asylosaurus.

Synonymy list
YearName and author
2007Asylosaurus yalensis Galton pp. 555-556 figs. 6A-D, 7B-F, 8A-F, 11A-C, 13, 14I-M, 15A-P, 17A-J, 19, 24F-J, 25A-F

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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()
RankNameAuthor
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Eusaurischia
Sauropodomorpha(Huene 1932)
genusAsylosaurus
speciesyalensis

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. M. Galton 2007autapomorphies : deltopectoral crest symmetrical in lateral view with the gently rounded apex at 25 % (measured perpendicular to long axis of humerus) of humeral length, manus with lateral reduction so phalangeal formula 2-3-4-2-1, distally the thickest parts of the ischia are separated by a cleft that is Λ-shaped in dorsal view ; plesiomorphies : low deltopectoral crest (also in Pantydraco caducus but apex asymmetrical at 40 % of humeral length) with large medial tubercle adjacent to head (also in most basal sauropodomorphs, small in P. caducus), distal tarsal I transversely narrower than metatarsal I (occurs in no other basal sauropodomorph) and transversely narrow metacarpals I (and phalanx 1, also in Efraasia minor) and II-IV (also in E. minor and Anchisaurus polyzelus).