Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections

Tropidemys langii

Reptilia - Testudines - Plesiochelyidae

Discussion

NMS uncat. (paralectotypes), an isolated neural and an isolated costal V (Rütimeyer 1873a, pl. 7.3–4). Additional paralectotypes possibly exist but are impossible to identify with certainty based on the original publication. Rütimeyer (1873a) established Tropidemys langii based on a type series consisting of a large fragment of the pos- terior region of a carapace, several isolated neurals and costals, and several fragments of plastron from the Kimmeridgian of Solothurn, Switzerland. Since no specimen numbers are men- tioned in the original publication, it is difficult to be certain as to which specimens are part of the type series, notably, regard- ing the isolated neurals and costals. Bräm (1965) concluded that all but one of the plastron fragments should be referred to Tha- lassemys hugii, but the remaining specimen (NMS 8651, for- merly NMS 19) was subsequently also excluded from Tropidemys langii based on comparison with more complete material from the vicinity of Porrentruy (Püntener et al. 2014). Therefore, the large fragment of carapace (NMS 8554, formerly NMS 16) is the only unambiguous syntype. Bräm (1965) incorrectly referred to this specimen as the holotype, but, according to the ICZN rules, this should nevertheless be interpreted as a valid lectotype designation (ICZN 1999, art. 74.5). An isolated neural and costal V are the only known potential paralectotypes as they were illustrated by Rütimeyer (1873a), but no attempt has been made to find them in the NMS collections.

Taxonomy
Tropidemys langii was named by Rütimeyer (1873). Its type specimen is NMS 8554 (lectotype; formerly NMS 16), a partial shell (posterior part of a carapace), and it is a 3D body fossil. Its type locality is Limestone quarry within or around Solothurn, which is in a Kimmeridgian shallow subtidal limestone in the Reuchenette Formation of Switzerland.

It was corrected as Tropidemys langi by Delair (1958), Bräm (1965) and Lapparent de Broin et al. (1996).

Synonyms
Synonymy list
YearName and author
1873Tropidemys langii Rütimeyer p. 43
1873Tropidemys expansa Rütimeyer p. 44 figs. Plate 9
1873Tropidemys gibba Rütimeyer p. 45 figs. Plate 4
1873Craspedochelys plana Rütimeyer p. 91
1889Tropidemys langii Lydekker pp. 156-157 fig. 38
1958Tropidemys langi Delair p. 55
1965Tropidemys langi Bräm p. 176
1996Tropidemys langi Lapparent de Broin et al. p. 562
2014Tropidemys langii Anquetin et al.
2014Tropidemys langii Puntener et al.
2017Tropidemys langii Anquetin et al.

Is something missing? Join the Paleobiology Database and enter the data

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
specieslangii

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 langii can be diagnosed as a “plesiochelyid” and a representative of Tropidemys by the full list of shell characters provided for those taxa above. Tropidemys langii differs from Tropidemys seebachi by having five vertebral scutes.