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Thalassemys bruntrutana n. sp., a new coastal marine turtle from the Late Jurassic of Porrentruy (Switzerland), and the paleobiogeography of the Thalassemydidae.

Püntener C, Anquetin J, Billon-Bruyat JP - PeerJ (2015)

Bottom Line: Results.Our results show that Th. hugii and Th. bruntrutana also occur simultaneously in the Kimmeridgian of Solothurn as well as in the Kimmeridgian of England (Kimmeridge Clay).This study is an important step towards a better understanding of the paleobiogeographic distribution of Late Jurassic turtles in Europe.

View Article: PubMed Central - HTML - PubMed

Affiliation: Section d'archéologie et paléontologie, Office de la Culture, République et Canton du Jura , Porrentruy , Switzerland.

ABSTRACT
Background. The Swiss Jura Mountains are a key region for Late Jurassic eucryptodiran turtles. Already in the mid 19th century, the Solothurn Turtle Limestone (Solothurn, NW Switzerland) yielded a great amount of Kimmeridgian turtles that are traditionally referred to Plesiochelyidae, Thalassemydidae, and Eurysternidae. In the past few years, fossils of these coastal marine turtles were also abundantly discovered in the Kimmeridgian of the Porrentruy region (NW Switzerland). These findings include numerous sub-complete shells, out of which we present two new specimens of Thalassemys (Thalassemydidae) in this study. Methods. We compare the new material from Porrentruy to the type species Th. hugii, which is based on a well preserved specimen from the Solothurn Turtle Limestone (Solothurn, Switzerland). In order to improve our understanding of the paleogeographic distribution of Thalassemys, anatomical comparisons are extended to Thalassemys remains from other European countries, notably Germany and England. Results. While one of the two Thalassemys specimens from Porrentruy can be attributed to Th. hugii, the other specimen represents a new species, Th. bruntrutana n. sp. It differs from Th. hugii by several features: more elongated nuchal that strongly thickens anterolaterally; wider vertebral scales; proportionally longer plastron; broader and less inclined xiphiplastron; wider angle between scapular process and acromion process. Our results show that Th. hugii and Th. bruntrutana also occur simultaneously in the Kimmeridgian of Solothurn as well as in the Kimmeridgian of England (Kimmeridge Clay). This study is an important step towards a better understanding of the paleobiogeographic distribution of Late Jurassic turtles in Europe.

No MeSH data available.


Related in: MedlinePlus

Carapaces of Thalassemys.(A, B) Thalassemys bruntrutana, specimen MJSN SCR011-87 (Kimmeridgian, Porrentruy, Switzerland); (C, D) Thalassemys hugii, specimen NMS 8595–8609 (Kimmeridgian, Solothurn, Switzerland). Line width indicates natural borders (thick lines), bone sutures (medium lines), and fractures (thin lines); double lines indicate scale sulci; matrix is gray. Abbreviations: co, costal; n, neural; sp, suprapygal; v, vertebral scale; *, intermediate element (see text).
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fig-3: Carapaces of Thalassemys.(A, B) Thalassemys bruntrutana, specimen MJSN SCR011-87 (Kimmeridgian, Porrentruy, Switzerland); (C, D) Thalassemys hugii, specimen NMS 8595–8609 (Kimmeridgian, Solothurn, Switzerland). Line width indicates natural borders (thick lines), bone sutures (medium lines), and fractures (thin lines); double lines indicate scale sulci; matrix is gray. Abbreviations: co, costal; n, neural; sp, suprapygal; v, vertebral scale; *, intermediate element (see text).

Mentions: Illustrations of type. Rütimeyer (1873: plate I); Bräm (1965: plate 7); Anquetin, Püntener & Billon-Bruyat (2014: Figs. 6A–6D); Figs. 3C–3D, 6C–6D and 7C–7D.


Thalassemys bruntrutana n. sp., a new coastal marine turtle from the Late Jurassic of Porrentruy (Switzerland), and the paleobiogeography of the Thalassemydidae.

Püntener C, Anquetin J, Billon-Bruyat JP - PeerJ (2015)

Carapaces of Thalassemys.(A, B) Thalassemys bruntrutana, specimen MJSN SCR011-87 (Kimmeridgian, Porrentruy, Switzerland); (C, D) Thalassemys hugii, specimen NMS 8595–8609 (Kimmeridgian, Solothurn, Switzerland). Line width indicates natural borders (thick lines), bone sutures (medium lines), and fractures (thin lines); double lines indicate scale sulci; matrix is gray. Abbreviations: co, costal; n, neural; sp, suprapygal; v, vertebral scale; *, intermediate element (see text).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4592157&req=5

fig-3: Carapaces of Thalassemys.(A, B) Thalassemys bruntrutana, specimen MJSN SCR011-87 (Kimmeridgian, Porrentruy, Switzerland); (C, D) Thalassemys hugii, specimen NMS 8595–8609 (Kimmeridgian, Solothurn, Switzerland). Line width indicates natural borders (thick lines), bone sutures (medium lines), and fractures (thin lines); double lines indicate scale sulci; matrix is gray. Abbreviations: co, costal; n, neural; sp, suprapygal; v, vertebral scale; *, intermediate element (see text).
Mentions: Illustrations of type. Rütimeyer (1873: plate I); Bräm (1965: plate 7); Anquetin, Püntener & Billon-Bruyat (2014: Figs. 6A–6D); Figs. 3C–3D, 6C–6D and 7C–7D.

Bottom Line: Results.Our results show that Th. hugii and Th. bruntrutana also occur simultaneously in the Kimmeridgian of Solothurn as well as in the Kimmeridgian of England (Kimmeridge Clay).This study is an important step towards a better understanding of the paleobiogeographic distribution of Late Jurassic turtles in Europe.

View Article: PubMed Central - HTML - PubMed

Affiliation: Section d'archéologie et paléontologie, Office de la Culture, République et Canton du Jura , Porrentruy , Switzerland.

ABSTRACT
Background. The Swiss Jura Mountains are a key region for Late Jurassic eucryptodiran turtles. Already in the mid 19th century, the Solothurn Turtle Limestone (Solothurn, NW Switzerland) yielded a great amount of Kimmeridgian turtles that are traditionally referred to Plesiochelyidae, Thalassemydidae, and Eurysternidae. In the past few years, fossils of these coastal marine turtles were also abundantly discovered in the Kimmeridgian of the Porrentruy region (NW Switzerland). These findings include numerous sub-complete shells, out of which we present two new specimens of Thalassemys (Thalassemydidae) in this study. Methods. We compare the new material from Porrentruy to the type species Th. hugii, which is based on a well preserved specimen from the Solothurn Turtle Limestone (Solothurn, Switzerland). In order to improve our understanding of the paleogeographic distribution of Thalassemys, anatomical comparisons are extended to Thalassemys remains from other European countries, notably Germany and England. Results. While one of the two Thalassemys specimens from Porrentruy can be attributed to Th. hugii, the other specimen represents a new species, Th. bruntrutana n. sp. It differs from Th. hugii by several features: more elongated nuchal that strongly thickens anterolaterally; wider vertebral scales; proportionally longer plastron; broader and less inclined xiphiplastron; wider angle between scapular process and acromion process. Our results show that Th. hugii and Th. bruntrutana also occur simultaneously in the Kimmeridgian of Solothurn as well as in the Kimmeridgian of England (Kimmeridge Clay). This study is an important step towards a better understanding of the paleobiogeographic distribution of Late Jurassic turtles in Europe.

No MeSH data available.


Related in: MedlinePlus