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Eurysternidae
Taxonomy
Eurysternidae was named by Dollo (1886). It was considered monophyletic by Anquetin et al. (2017).
It was assigned to Eucryptodira by Joyce (2000), Karl et al. (2012) and Anquetin and Joyce (2014); and to Thalassochelydia by Anquetin et al. (2017) and Püntener et al. (2020).
It was assigned to Eucryptodira by Joyce (2000), Karl et al. (2012) and Anquetin and Joyce (2014); and to Thalassochelydia by Anquetin et al. (2017) and Püntener et al. (2020).
Subtaxa
Synonyms
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Synonymy list
Year | Name and author |
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1886 | Eurysternidae Dollo |
1915 | Plesiochelys minima Oertel |
2000 | Eurysternidae Joyce p. 686 |
2012 | Eurysternidae Karl et al. |
2014 | Eurysternidae Anquetin and Joyce |
2017 | Eurysternidae Anquetin et al. |
2020 | Eurysternidae Püntener 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.
Fm. †Eurysternidae Dollo 1886
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G. †Idiochelys Meyer 1839
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†Idiochelys fitzingeri Meyer 1839
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Invalid names: Chelonemys ovata Jourdan 1862 [synonym], Chelonemys plana Jourdan 1862 [synonym], Idiochelys wagneri Meyer 1846 [synonym]
G. †Palaeomedusa Meyer 1860
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†Palaeomedusa testa von Meyer 1860
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Invalid names: Eurysternum crassipes Wagner 1861 [objective synonym]
Invalid names: Plesiochelys minima Oertel 1915 [nomen dubium]
Diagnosis
Reference | Diagnosis | |
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J. Anquetin et al. 2017 | Representatives of the Thalassochelydia are currently diagnosed relative to other turtles by the following derived characters: presence of a long posteroventral process of the parietal that forms the posterior margin of the foramen nervi trigemini and excludes the prootic from that foramen, and the development of a ventrally infolding ridge on the posterior surface of the processus articularis of the quadrate. The presence of three cervical scutes is probably also a diagnostic feature of the group. |
Measurements
No measurements are available
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Source: c = class, subp = subphylum, uc = unranked clade | |||||
References: Hendy et al. 2009, Carroll 1988 |
Age range: base of the Late/Upper Kimmeridgian to the top of the MN 4 or 155.70000 to 15.97000 Ma
Collections (14 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Kimmeridgian | Switzerland (Jura) | Eurysternidae indet. (154715) | |
Early/Lower Kimmeridgian | Germany (Lower Saxony) | Chelonides wittei (138029) | |
Early/Lower Kimmeridgian | Germany (Nordrhein-Westfalen) | Idiochelys fitzingeri (182492) | |
Late/Upper Kimmeridgian | Germany (Eastern Barvaria) | Eurysternidae indet. (187436) | |
Late/Upper Kimmeridgian | France | Idiochelys fitzingeri, Chelone meyeri, Chelonemys ovata, Chelonemys plana (24426) | |
Late/Upper Kimmeridgian | Germany (Bayern) | Eurysternidae indet. (59175) Idiochelys fitzingeri, Palaeomedusa testa, Idiochelys wagneri, Plesiochelys minima, Eurysternum crassipes (57682) | |
Late/Upper Kimmeridgian | Germany (Baden-Württemberg) | Eurysternum sp. (154138) | |
Late/Upper Kimmeridgian | Switzerland (Jura) | Eurysternidae indet. (180788 180789) | |
Tithonian | Germany (Franconia) | Palaeomedusa testa (24521) | |
Early/Lower Tithonian | Germany | Parachelys eichstaettensis (121197) | |
Middle Cenomanian - Late/Upper Cenomanian | Germany | Hydropelta sp. (74183) | |
MN 4 | Spain (Catalonia) | Parachelys catalaunica (176265) |