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Thalassemys bruntrutana
Discussion
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Taxonomy
Thalassemys bruntrutana was named by Puntener et al. (2015). Its type specimen is MJSN SCR011-87, a partial skeleton (carapace and plastron+left scapula), and it is a 3D body fossil. Its type locality is Sur Combe Ronde (Lower Virgula Marls), which is in a Kimmeridgian marine marl in the Reuchenette Formation of Switzerland.
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Thalassemys bruntrutana Puntener et al. p. 9 figs. 3-7 |
| 2017 | Thalassemys bruntrutana Anquetin et al. |
| 2021 | Thalassemys bruntrutana Joyce et al. |
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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 bruntrutana Puntener et al. 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Puntener et al. 2015 | "Differing from Th. hugii in: more elongated nuchal (in anteroposterior direction) that strongly thickens anterolaterally on the ventral surface; wider vertebrals scales; proportionally longer plastron; broader and less inclined xiphiplastron; wider angle
between scapular process and acromion process. Differing from Th. marina in: wider vertebrals scales; less pronounced lateral plastral fontanelles." | |
| J. Anquetin et al. 2017 | Thalassemys bruntrutana can be diagnosed as a rep- resentative of Thalassemys by the full list of characters provided for that taxon above. Thalassemys bruntrutana differs from all other Thalassemys by having a more elongated nuchal with strong anterolateral thickening on the ventral surface (difficult to observe in Thalassemys marina) and wider vertebral scutes. Thalassemys bruntrutana furthermore differs from Thalassemys hugii by having a proportionally longer plastron, broader and less inclined xiphiplastra, and a wider scapular angle. It differs from Thalassemys marina by having less pronounced lateral plastral fontanelles. | |
| W. G. Joyce et al. 2021 | Thalassemys bruntrutana can be diagnosed as a member of Thalassochelydia by the likely presence of three cervical scutes and as a member Thalassemys by large size (carapace length greater than 60 cm); development of a round carapace that lacks a distinct nuchal notch; absence of costo-peripheral fontanelles in adults; vertebral scutes with anterolaterally concave and posterolaterally convex margins; presence of an osseous bridge in adults; presence of lateral and central plastral fontanelles in adults; absence of sutural contact between the hyoplastra and the more anterior plastral elements; and a scapular angle greater than 110°. Thalassemys bruntrutana differs from Thalassemys hugii by the presence of a more elongated nuchal with strong anterolateral thickening on the ventral surface; broader vertebral scutes; a proportionally longer, but broader plastron with triangular lobes and less inclined xiphiplastra; presence of separate lateral, central, and xiphiplastral fontanelles; and a wider scapular angle. Thalassemys bruntrutana differs from Thalassemys marine by the development of broader vertebral scutes. Thalassemys bruntrutana further differs from other thalassochelydians by the presence of an elongate cranium and mandible with moderate lower temporal emargination and an elongate symphysis; 10 pairs of peripherals; strap-like epiplastra that bluntly cover the anterolateral margins of the hyoplastra; and manus and pes that are transformed into elongate stiffened paddles, but it is unclear how these characters are developed within Thalassemys |