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Tropidemys seebachi

Reptilia - Testudines - Plesiochelyidae

Discussion

GZG 769-3, GZG 773-20, GZG 773-34, and GZG 773-43 (paralectotypes), isolated costal, hyoplastron, and hypoplastra (Maack 1869, pls. 34.21, 35.35, 36.44; Portis 1878, pl. 15.3–5; Karl, Gröning and Brauckmann 2012, pls. 1.1, 2, 2.3, 4, 2.5, 6). Portis (1878) erected Tropidemys seebachi based on a series of five specimens, including an anterior part of carapace that was recently designated as the lectotype (Karl, Gröning and Brauckmann 2012). Among the four paralectotypes, three iso- lated plastral fragments are of questionable affinity, especially considering that they also serve as part of the type series of Style- mys lindenensis Maack, 1869 and Stylemys hannoverana Maack, 1869 (see below). Portis (1878) transferred these to Tropidemys seebachi based on a strong resemblance with plastral material from Solothurn referred to Tropidemys langii by Rütimeyer (1873a). However, this attribution of the Solothurn material was recently shown to be incorrect (Püntener et al. 2014), and there is therefore no solid evidence to support the assignment of the three aforementioned plastral elements to Tropidemys seebachi.

Taxonomy
Tropidemys seebachi was named by Portis (1878). Its type specimen is GZG 769-1 (lectotype), a partial shell (articulated anterior part of a carapace, including four neurals and five incomplete costals), and it is a 3D body fossil. Its type locality is Tönjesbergs, near Hannover, which is in a Kimmeridgian marine horizon in Germany.

Synonymy list
YearName and author
1878Tropidemys seebachi Portis p. 7 figs. Plate 1, figs 1-5
2014Tropidemys seebachi Puntener et al.
2017Tropidemys seebachi Anquetin 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
Thalassochelydia
familyPlesiochelyidaeRütimeyer 1873
genusTropidemys
speciesseebachi

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
J. Anquetin et al. 2017Tropidemys seebachi can be diagnosed as a “ple- siochelyid” and a representative of Tropidemys by the full list of shell characters provided for those taxa above. Tropidemys seebachi differs from Tropidemys langii by the presence of more than five vertebral scutes.