Ostrea edulis Linnaeus, 1758
Barents Sea to Mediterranean, including Baltic & N. Black Seas; cultivated in California and Washington State; established self-sustaining populations are found from Nova Scotia to Rhode Island; introduced in Australia and Alaska; present in Baja California. « Cemented to hard substrates and forming dense beds from low in the intertidal to 50m » (MBSBI).

Grau de la Vieille Nouvelle, Gruissan, Occitania, S. France. 70mm. Original picture provided by A. Bertrand (FR).
– (CC BY-NC-SA) –
The left valve, attached to the substratum, contains the animal. The right valve is a plat cap.
Ostrea edulis in Forbes & Hanley: A history of British Mollusca and their shells, London 1853, via BHL.
Left valve found at low tide, Plage de l’Éventail, Saint-Malo, N. Brittany, NW. France. 120mm.
European Flat Oysters sold for consumption in a fish market at Rennes, E. Brittany.
On rock at the base of the jetty, seaside, Šilo harbour, eastern coast of Krk island, Primorje-Gorski Kotar Comitat, N. Croatia. Original picture provided by S. Pav for iNaturalist.
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