Eurysternum is an extinct genus of sea turtle. Its type species is Eurysternum wagleri, the holotype of which has since been lost and only survives in illustrations.
Eurysternum ignoratum Bram, 1965 is a junior synonym of Thalassemys hughii. The Late Jurassic species Eurysternum neuquinum Fernandez and de la Fuente, 1988, described from marine deposits in Argentina, is now placed in its own genus Neusticemys.
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