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Ballerstedtia typocardia
Taxonomy
Pleurosternon typocardium was named by Seeley (1869). Its type specimen is CAMSM J.5329 (Seeley No. 4), a shell (complete carapace in dorsal aspect), and it is a 3D body fossil. It is the type species of Ballerstedtia.
It was synonymized subjectively with Pleurosternum bullocki by Delair (1958); it was recombined as Glyptops typocardium by Milner (2004); it was recombined as Ballerstedtia typocardia by Karl et al. (2012); it was recombined as Dorsetochelys typocardium by Pérez-García (2014).
It was synonymized subjectively with Pleurosternum bullocki by Delair (1958); it was recombined as Glyptops typocardium by Milner (2004); it was recombined as Ballerstedtia typocardia by Karl et al. (2012); it was recombined as Dorsetochelys typocardium by Pérez-García (2014).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1869 | Pleurosternon typocardium Seeley p. 87 |
| 1889 | Thalassemys ruetimeyeri Lydekker p. 149 fig. 36 |
| 1910 | Glyptops ruetimeyeri Watson p. 377 figs. 1-2 |
| 1958 | Glyptops reutimeyeri Delair p. 51 |
| 1976 | Dorsetochelys delairi Evans and Kemp p. 318 figs. text-figs 1–2 |
| 2004 | Glyptops typocardium Milner p. 1445 figs. Text-figs 5B, 8A, 9 |
| 2004 | Dorsetochelys delairi Milner pp. 1463-1464 |
| 2011 | Dorsetochelys delairi Pérez-García and Ortega |
| 2012 | Ballerstedtia bueckebergensis Karl et al. p. 51 |
| 2012 | Ballerstedtia typocardia Karl et al. p. 54 |
| 2013 | Dorsetochelys delairi Pérez-García and Murelaga |
| 2014 | Dorsetochelys delairi Perea et al. |
| 2014 | Dorsetochelys delairi Puntener et al. |
| 2014 | Dorsetochelys typocardium Pérez-García |
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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.
†Ballerstedtia typocardia Seeley 1869
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Milner 2004 | Carapace depressed with a midline ‘hump’, basically oval in shape but with very pronounced nuchal emargination, the nuchal element itself being highly concave. Posterolateral peripheral bones normally not emarginated (emargination in one specimen may represent healed damage). Eight neurals and two suprapygals, the first suprapygal a wide rhomboid, twice as wide as long and with posterior width over twice the anterior width. Costal 1 is an irregular rhomboid, slightly less than twice as long as wide. Outer costal outline heart-shaped, narrowing posteriorly in contrast to oval carapace outline. Small rectangular cervical scute separates first marginal scutes over anterior half of nuchal bone. Vertebral scutes about one-quarter width of carapace with vertebral 1 almost as large as vertebral 2. Pleural scutes overlapping peripheral bones and covering about a quarter of their area. Carapace outer surface is smooth and mostly covered in poorly defined or coarse pitting. Growing to at least an estimated carapace length of 0·3 m (BMNH 40676 and CAMSM J5329). |