Classification of Karl et al. 2012

Unr. Eucryptodira Gaffney 1975
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Fm. †Eurysternidae Dollo 1886
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G. †Eurysternum Meyer 1839
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†Eurysternum wagleri Meyer 1839
Fm. †Thalassemydidae Zittel 1889
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G. †Idiochelys Meyer 1839
G. †Solnhofia Gaffney 1975
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†Solnhofia parsonsi Gaffney 1975
G. †Sontiochelys Stache 1905
G. †Thalassemys Rütimeyer 1859
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†Thalassemys cava Nessov 1984
†Thalassemys hugii Rütimeyer 1873
Invalid names: Parathalassemys Nessov and Krassevskaya 1984 [synonym]
†Thalassemys carva Nessov 1984
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Invalid names: Thalassemys cava Nessov 1984 [misspelling]