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Ostrea is a genus of edible oysters, marine bivalve mollusks in the family Ostreidae, the oysters.

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The dredge oyster or Bluff oyster, Ostrea chilensis, known in Chile as ostra chilena, the Chilean oyster, is a species of marine bivalve mollusc in the family Ostreidae.

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The southern mud oyster, Australian flat oyster, native flat oyster, native mud oyster, or angasi oyster, is endemic to southern Australia, ranging from Western Australia to southeast New South Wales and around Tasmania. Ostrea angasi superficially resembles Ostrea edulis and both species may be referred to with the name “flat oyster”. However, the two species do not occur naturally in the same geographic distribution.

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Ostrea conchaphila is a species of oyster, a marine bivalve mollusk which lives on the Pacific coast of Mexico south of Baja California. Until recently there was some confusion as to whether this more southern oyster species might in fact be the same species as Ostrea lurida, the well-known but more northerly "Olympia oyster", which it resembles in shell size and color. Because of this confusion, the name O. conchaphila was sometimes applied to various populations of what is now known to be O. lurida.

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Ostrea edulis, commonly known as the European flat oyster, is a species of oyster native to Europe. In the British Isles, regional names include Colchester native oyster, mud oyster, or edible oyster. In France, Ostrea edulis are known as huîtres plates except for those that come from the Belon River estuary in Brittany, France, which are known as Belons.

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Ostrea equestris, commonly known as the crested oyster or horse oyster, is a species of bivalve mollusc in the family Ostreidae. It can be found along the Atlantic coast of North and South America, ranging from Virginia to Patagonia.

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Ostrea lurida, common name the Olympia oyster, after Olympia, Washington in the Puget Sound area, is a species of edible oyster, a marine bivalve mollusk in the family Ostreidae. This species occurs on the northern Pacific coast of North America. Over the years the role of this edible species of oyster has been partly displaced by the cultivation of non-native edible oyster species.

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Ostrea is a genus of edible oysters, marine bivalve mollusks in the family Ostreidae, the oysters.

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Ostrea stentina is a species of oysters, marine bivalve mollusks in the family Ostreidae, the oysters.