Ostrea edulis Linnaeus,1758Ostreoidea : Ostreidae
To size: To 100mm. Shell Structure: Solid becoming heavy. Equivalve: Inequivalve; lower valve shallowly cupped; upper valve flat. Equilateral: Inequilateral. Outline: Irregularly subcircular to suboval; lower valve with irregular extensions and irregularly fluted, upper valve more regular.
Sculpture: Upper valve with irregular co-marginal ridges, some radial ribbing and often foliaceous; lower valve with stronger radiating ribs and riblets with scales at intersections with co-marginal ridges. Margin: Ostreiine chomata on margins close to ligament, smooth elsewhere. Ligament: Alivincular, internal on a shallow triangular resilifer. Pallial Musculature: Adductor scar kidney shaped, colour as shell, white. Colour: Upper valve mostly yellowish through pale brown to greenish brown with darker to purplish markings. Lower valve similar but paler. Internal white.
Distribution & Ecology
Cemented to hard substrates and forming dense beds from low in the intertidal to 50m. On all coasts but now severely depleted (especially in the North Sea) in the wild but extensively cultured on south and west coasts.
The current status of this species in the UK can be found at <http://www.ukbap.org.uk/UKPlans.aspx?ID=495>
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
Generally more circular in outline and flatter than Crassostrea and never has a pigmented adductor scar.
Listed are literature citing Ostrea edulis Linnaeus,1758. Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
- Conchological Society
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- Malacological Society
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