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Echmatemys stevensoniana

Reptilia - Testudines - Geoemydidae

Taxonomy
Emys stevensonianus was named by Leidy (1870). Its type specimen is USNM 963+965+967 (syntypes), a partial shell, and it is a 3D body fossil. Its type locality is A few miles from Fort Bridger, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.

It was recombined as Echmatemys stevensoniana by Vlachos (2018).

Synonyms
Synonymy list
YearName and author
1870Emys stevensonianus Leidy p. 6
1873Emys septarius Cope p. 625
1875Emys stevensonianus Cope p. 36
1882Emys septaria Cope p. 992
1884Emys septaria Cope p. 139
1902Emys septaria Hay p. 448
1906Echmatemys septaria Hay p. 27
1908Echmatemys ocyrrhoe Hay
1908Echmatemys septaria Hay p. 319
1908Echmatemys aegle Hay p. 346
1908Echmatemys cyane Hay p. 346
1908Echmatemys ocyrrhoe Hay p. 346
1962Echmatemys septaria Roberts p. 386
2000Echmatemys septaria Zonneveld et al.
2018Echmatemys stevensoniana Vlachos

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
RankNameAuthor
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
Pantestudinoidea
superfamilyTestudinoidea
Pangeoemydidae
familyGeoemydidaeTheobald 1868
genusEchmatemys
speciesstevensoniana()

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. Vlachos 2018Echmatemys stevensoniana can be diagnosed as a member of Echmatemys based on the characters listed for that clade above. Echmatemys stevensoniana differs from other Echmatemys based on the following combination of characters: neurals II–VIII hexagonal, suprapygal longer than wide and with narrow anterior border, contact of marginal II with vertebral I, and vertebral IV/V sulcus crossing suprapygal I.