The term Ostrea diluviana does not appear in widely recognized encyclopedic references as a currently accepted scientific name for a living species. It is likely a taxonomic designation historically applied to a fossil oyster species within the genus Ostrea (family Ostreidae). The specific epithet diluviana derives from Latin diluvium, meaning “flood” or “deluge,” a term historically used in geology to refer to deposits associated with the Biblical Flood or, more generally, to post‑glacial sediments.
Because detailed, verifiable information about the morphology, stratigraphic occurrence, geographic distribution, or taxonomic status of Ostrea diluviana is lacking in major scientific databases and reference works, the entry cannot be expanded beyond this brief contextual and etymological note. Further investigation in specialized paleontological literature or taxonomic revisions would be required to provide a comprehensive description.