PBDB Taxon

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

Thalassemys hugii

Reptilia

Discussion

With the exception of the lectotype, it is unclear which other specimens once formed the syntype series.

Taxonomy

Thalassemys hugii was named by Rütimeyer (1873). Its type specimen is NMS 8595 to NMS 8609 (lectotype; formerly NMS 1), a partial skeleton (A large carapace plus associated plastron fragments and postcranial remains), and it is a 3D body fossil. Its type locality is Cirin, Ain, BMNH Coll., which is in a Kimmeridgian marine horizon in France.

Synonyms

Thalassemys gresslyi was named by Rütimeyer (1873). Its type specimen is NMS 8555 (holotype), a partial shell (anterior part of a large, partly disarticulated 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 synonymized subjectively with Thalassemys hugii by Bräm (1965), Anquetin et al. (2014) and Anquetin et al. (2017).
Eurysternum ignoratum was named by Bräm (1965). Its type specimen is NMS 8612 to NMS 8627 (holotype; formerly NMS 5), a partial skeleton (disarticulated and fragmentary remains of the shell and postcranium, including three costals, the hyoplastra, the scapulae, a humerus, and the pubes), 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 recombined as Solnhofia ignoratum by Lapparent de Broin et al. (1996); it was synonymized subjectively with Thalassemys hugii by Anquetin et al. (2014) and Anquetin et al. (2017).

Synonymy list

Year	Name and author
1873	Thalassemys hugii Rütimeyer p. 27
1873	Thalassemys gresslyi Rütimeyer p. 39
1889	Thalassemys hugii Lydekker p. 148
1965	Thalassemys hugii Bräm p. 143
1965	Eurysternum ignoratum Bräm p. 166 figs. Plate 8, fig. 6
1996	Solnhofia ignoratum Lapparent de Broin et al. p. 562
2000	Eurysternum ignoratum Joyce p. 699
2012	Thalassemys hugii Karl et al.
2014	Thalassemys hugii Anquetin et al.
2017	Thalassemys hugii Anquetin et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda

Rank	Name	Author
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
—	Testudinata	(Oppel 1811)
—	Thalassochelydia
genus	Thalassemys	Rütimeyer 1859
species	hugii

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.

†Thalassemys hugii Rütimeyer 1873

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Invalid names: Eurysternum ignoratum Bräm 1965 [synonym], Thalassemys gresslyi Rütimeyer 1873 [synonym]

Diagnosis

Reference	Diagnosis
J. Anquetin et al. 2017	Thalassemys hugii can be diagnosed as a representative of Thalassemys by the full list of characters provided for that taxon above. Thalassemys hugii differs from all other Thalassemys by having narrower vertebral scutes. Thalassemys hugii further differs from Thalassemys bruntrutana by having a proportionally wider nuchal without anterolateral thickening on the ventral surface, a proportionally shorter plastron, narrower and more inclined xiphiplastra, and a smaller scapular angle, and differs from Thalassemys marina by having less pronounced lateral plastral fontanelles.