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Segisaurus halli

Reptilia -

Taxonomy
Segisaurus halli was named by Camp (1936). Its type specimen is UCMP 32101, a set of postcrania, and it is a 3D body fossil. Its type locality is Keet Seel, Segi Canyon (UCMP V3308), which is in a Pliensbachian/Toarcian dune sandstone/shale in the Navajo Sandstone Formation of Arizona. It was considered monophyletic by Carrano et al. (2005).

It was considered a nomen dubium by Ostrom (1981).

Synonymy list
YearName and author
1936Segisaurus halli Camp
1950Segisaurus halli Gregory p. 76
1970Segisaurus halli Steel p. 12
1978Segisaurus halli Bonaparte p. 321
1984Segisaurus halli Welles p. 174
1986Segisaurus halli Gauthier p. 9
1988Segisaurus halli Paul p. 295
1989Segisaurus halli Rowe p. 125
1990Segisaurus halli Rowe and Gauthier p. 152
1992Segisaurus halli Sereno and Wild p. 435
1997Segisaurus halli Rowe et al. p. 108
2003Segisaurus halli Rauhut p. 19
2004Segisaurus halli Tykoski and Rowe p. 48
2005Segisaurus halli Carrano et al. p. 835
2005Segisaurus halli Irmis pp. 61-63
2005Segisaurus halli Yates p. 107
2007Segisaurus halli Nesbitt et al. p. 235
2010Segisaurus halli Langer et al. p. 91
2016Segisaurus halli Martill et al. p. 21

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
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()
Theropoda()
Neotheropoda
superfamilyCoelophysoidea
genusSegisaurus
specieshalli

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
M. T. Carrano et al. 2005Small coelophysoid theropod dinosaur with a rectangular humeral deltopectoral crest, narrow scapular blade, and a large, rounded foramen in the proximoventral ischiadic plate (modified from Rauhut, 2003).