| Thalassemys Temporal range: Late Jurassic |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Sauropsida |
| Order: | Testudines |
| Suborder: | Cryptodira |
| Family: | Plesiochelyidae |
| Genus: | Thalassemys Rutimeyer, 1858 |
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Thalassemys is genus of a Late Jurassic fossil sea turtle that includes the species T. hugii, T. moseri, T ruetimeyeri, and T. marina.