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Segisaurus halli

Reptilia - Coelophysidae

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
1939Segisaurus halli Kuhn p. 73
1950Segisaurus halli Gregory p. 76
1957Segisaurus halli Harshbarger et al. p. 30
1967Segisaurus halli Charig p. 713
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
2017Segisaurus halli Ezcurra p. 508
2018Segisaurus halli Dal Sasso et al. p. 30
2018Segisaurus halli Tweet and Santucci p. 714

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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
superfamilyCoelophysoidea
familyCoelophysidae
subfamilyCoelophysinae
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.

†Segisaurus halli Camp 1936
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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).
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yesg
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: solitaryo
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: carnivoreo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-08-24 13:07:09
Modified: 2005-08-24 15:07:09
Source: g = genus, o = order
References: Peczkis 1995, Marsh 1875

Age range: base of the Pliensbachian to the top of the Toarcian or 190.80000 to 174.10000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Pliensbachian - Toarcian190.8 - 174.1USA (Arizona) Dinosauria indet. (type locality: 25306)