Crassostrea gigas (Thunberg, 1793)Ostreoidea : Ostreidae
To size: To 180mm. Shell Structure: Solid, heavy. Equivalve: Inequivalve, cemented valve deeply cupped, upper valve flat or slightly convex. Equilateral: Inequilateral. Outline: Irregularly suboval, usually much narrower towards umbos and margins irregularly extended and fluted.
Margin: Chomata absent. Ligament: Alivincular, internal on a triangular resilifer. Pallial Musculature: Adductor scar kidney shaped, reddish to purple black in colour.
Distribution & Ecology
This is the widely introduced commercial oyster. Oyster farms are now widespread around the coasts of UK and Ireland except for the northeast coast of England and east coast of Scotland.
Juveniles & Similar Species
Key Features & Similar Species
Listed are literature citing Crassostrea gigas (Thunberg, 1793). Reference containing the species Type Description is highlighted.
Thunberg C P 1793. Tekning och Beskrifning på en stor Ostronsort ifrån Japan. Kongliga Vetenskaps Academiens Nya Handlingar. 14 (4-6): 140-142, 1pl.
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