Eurysternum is an extinct genus of thalassochelydian turtle. Its type species is Eurysternum wagleri, the holotype of which has since been lost and only survives in illustrations.
Formerly assigned species Eurysternum ignoratum Bram, 1965 is a junior synonym of Thalassemys hughii.J. Anquetin, C. Puntener, and J.-P. Billon-Bruyat. 2014. A taxonomic review of the Late Jurassic eucryptodiran turtles from the Jura Mountains (Switzerland and France). PeerJ 2:e369 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.M. S. Fernandez and M. S. de la Fuente. 1993. Las tortugas casiquélidias de las calizas litográficas titonianas del área Los Catutos Argentina. Ameghiniana 30(3):283-295.
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