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Compsemys victa

Reptilia

Taxonomy
Compsemys victus was named by Leidy (1856). Its type specimen is USNM 960, a partial shell (a neural and two costal fragments), and it is a 3D body fossil. Its type locality is Long Lake, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of North Dakota.

It was misspelled as Compsemys victus by Leidy (1860), Marsh (1897), Hay (1902) and Hay (1930); it was corrected as Compsemys victa by Leidy (1856), Leidy (1857), Estes (1964), Estes and Berberian (1970), Gaffney (1972), Estes (1976), Bryant (1989), Holroyd and Hutchison (2002), Hutchison and Holroyd (2003), Burger (2007), Lyson and Joyce (2011), Hutchison et al. (2013), López-Conde et al. (2018) and Joyce and Anquetin (2019).

Synonyms
Synonymy list
YearName and author
1856Compsemys victa Leidy p. 312
1856Compsemys victus Leidy p. 312
1857Compsemys victa Leidy p. 90
1860Compsemys victus Leidy p. 152
1897Compsemys victus Marsh p. 527
1902Compsemys victus Hay p. 437
1910Compsemys parva Hay
1910Compsemys vafer Hay
1910Compsemys parva Hay pp. 308-310 figs. fig. 1, pl. 10 figs. 1-3
1910Compsemys vafer Hay pp. 311-313 figs. 2-5
1919Compsemys torrejonensis Gilmore p. 21 figs. Pl. 4:1-2
1919Compsemys puercensis Gilmore p. 198 figs. 1-2
1930Compsemys parvus Hay p. 89
1930Compsemys puercensis Hay p. 89
1930Compsemys torrejonensis Hay p. 89
1930Compsemys vafer Hay p. 89
1930Compsemys victus Hay p. 89
1964Compsemys victa Estes p. 98
1970Compsemys victa Estes and Berberian p. 5
1972Compsemys victa Gaffney pp. 249, 289 fig. 37
1976Compsemys victa Estes p. 507
1989Compsemys victa Bryant p. 41
2002Compsemys victa Holroyd and Hutchison p. 181
2003Compsemys victa Hutchison and Holroyd
2007Compsemys victa Burger p. 144
2011Compsemys victa Lyson and Joyce p. 790 figs. 1-2
2013Compsemys victa Hutchison et al.
2018Compsemys victa López-Conde et al.
2019Compsemys victa Joyce and Anquetin

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
RankNameAuthor
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
Paracryptodira
genusCompsemys
speciesvicta()

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.

Compsemys victa Leidy 1856
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Invalid names: Compsemys parva Hay 1910 [synonym], Compsemys puercensis Gilmore 1919 [synonym], Compsemys torrejonensis Gilmore 1919 [synonym], Compsemys vafer Hay 1910 [synonym]
Diagnosis
ReferenceDiagnosis
E. S. Gaffney 1972[as for genus Compsemys]
T. R. Lyson and W. G. Joyce 2011Placed along the phylogenetic stem of Paracryptodira by nasals that prevent frontals from entering narial opening; no medial contact of the prefrontals; foramen posterius canalis carotici interni located halfway along contact between pterygoid and basisphenoid; posterior plastral thickening medial to the bridge. Autapomorphies include: no cheek emargination; rectangular quadratojugal; quadratojugal extends ventrally to a level even with mandibular condyles of quadrate, covering up these condyles; postorbital contributes to rim of cavum tympani; cavum tympani diameter less than diameter of orbit; mesoplastra unusually large and with broad midline contact; first peripherals meet medially in front of nuchal, preventing the nuchal from being exposed along the anterior margin of carapace; deep xiphiplastral notch present, varying from Ushaped to V-shaped; sinuous midline sulcus on plastron.
W. G. Joyce and J. Anquetin 2019Compsemys victa can be diagnosed as a paracryptodire and a representative of Compsemys by the full list of characters listed for those clades above. Compsemys victa can most readily be differentiated from Compsemys russelli by possessing only a single, large suprapygal that has a lateral contact with peripheral X