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Stygiochelys

Reptilia - Testudines

Synonymy list
YearName and author
1971Stygiochelys Gaffney and Hiatt p. 2
1972Stygiochelys Gaffney pp. 248, 266-269 fig. 20,21,58
1988Stygichelys Carroll
1989Stygiochelys Bryant p. 36
2002Stygiochelys Holroyd and Hutchison p. 181
2003Stygiochelys Hutchison and Holroyd
2010Stygiochelys Lyson and Joyce
2011Stygiochelys Lyson and Joyce p. 792
2015Stygiochelys Joyce and Lyson
2016Stygiochelys Lyson et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
RankNameAuthor
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
Paracryptodira
Baenidae(Cope 1882)
BaenoddaGaffney and Meylan 1988
Eubaeninae(Williams 1950)
genusStygiochelys

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
E. S. Gaffney and R. Hiatt 1971Skull wedge-shaped, width equal to length; temporal emargination deep; nasals not expanded laterally; prefrontals with small dorsal lappet; no squamosal parietal contact; parietal larger than frontal; frontoparietal suture tends to be curved, concave posteriorly; quadratojugal C-shaped with dorsal process but without anterior expansion; orbits opening laterally; triturating surface smoothly convex without a high tomial ridge, as in Eubaena, but incipient secondary palate absent; cheek emargination not reaching lower level of orbit; maxillae laterally constricted; skull roof terminating in point over crista supraoccipitalis; jugal entering orbital margin.
E. S. Gaffney 1972Eubaenine with Eubaena-like triturating surface, smoothly convex, no high tomial ridge, but without development of incipient secondary palate as in Eubaena; preorbital skull length intermediate between Eubaena and Plesiobaena; cheek emargination not reaching lower level of orbit; lateral constriction of maxillae present; skull roof overlying CRISTA SUPRAOCCIPITALIs ending in point; jugal entering orbital margin; fronto-parietal suture tending to be curved.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialuc
Locomotion: actively mobilec
Created: 2017-04-17 15:15:35
Modified: 2017-04-17 15:15:35
Source: c = class, subp = subphylum, uc = unranked clade
References: Kiessling 2004, Carroll 1988, Hendy et al. 2009

Age range: base of the Lancian to the top of the Puercan or 70.60000 to 63.30000 Ma

Collections (5 total)


Time interval Ma Country or state Original ID and collection number
Maastrichtian72.1 - 66.0USA (Montana) S. estesi (123100)
Lancian70.6 - 66.0USA (Wyoming) S. sp. (14505)
Lancian70.6 - 66.0USA (Montana) S. estesi (14654)
Puercan66.0 - 63.3USA (Colorado) S. estesi (14678 168453)