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Alcovasaurus longispinus

Reptilia - Stegosauridae

Taxonomy
Stegosaurus longispinus was named by Gilmore (1914). It is not extant. Its type specimen is UW D54. Its type locality is Alcova Quarry (UW), which is in a Kimmeridgian/Tithonian terrestrial horizon in the Morrison Formation of Wyoming. It is the type species of Natronasaurus, Alcovasaurus.

It was recombined as Natronasaurus longispinus by Ulansky (2014), Ulansky (2014) and Ulansky (2014); it was considered a nomen dubium by Maidment et al. (2008); it was recombined as Alcovasaurus longispinus by Galton and Carpenter (2016).

Synonymy list
YearName and author
1914Stegosaurus longispinus Gilmore p. 111 fig. 66
1915Stegosaurus longispinus Hennig p. 11
1964Stegosaurus longispinus Kuhn p. 38
1990Stegosaurus longispinus Galton
2001Stegosaurus longispinus Carpenter et al. p. 70
2004Stegosaurus longispinus Galton and Upchurch p. 345
2006Stegosaurus longispinus Chure et al. p. 237
2006Stegosaurus longispinus Mateus p. 231
2007Stegosaurus longispinus Escaso et al. p. 371
2014Natronasaurus longispinus Ulansky p. 6
2016Alcovasaurus longispinus Galton and Carpenter p. 189

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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()
—Romeriida
RankNameAuthor
—Diapsida()
—Eosuchia()
—Neodiapsida
—SauriaGauthier 1984
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Thyreophora()
—Stegosauria()
familyStegosauridae
genusAlcovasaurus
specieslongispinus()

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 and K. Carpenter 2016Autapomorphies: all caudal vertebrae bear transverse processes; distal caudal centra short, so height greater than length; femoral condylar articular surface confined almost exclusively to the distal surface; two pairs of greatly elongate distal dermal tail spines (~90% of femoral length) with subequal bases and slender shafts; posterior pair widest at ~25% of length. Also differs from Morrison Stegosaurus stenops, S. ungulatus and Hesperosaurus mjosi in having six pairs of sacral ribs.