Anomia ephippium Linnaeus, 1758
Anomioidea : Anomiidae
To size: To 60mm. Shell Structure: Upper valve rather solid, lower valve thinner but robust. Equivalve: Inequivalve, upper (left) valve convex; lower (right valve) flat. Equilateral: Inequilateral, beaks close to the middle of the dorsal margin. Outline: Upper valve subcircular but irregular, lower valve similar with a large oval byssus foramen. Contour: Often deformed to fit shape of attachment area.
Sculpture: Upper valve surface scaly, may be worn smooth and lustrous but mostly overgrown with attached epifauna; lower valve scaly with comarginal lines and growth stops. Margin: Irregular but smooth. Ligament: In a half moon shaped pit beneath the beaks. Hinge: Obscure. Pallial Musculature: Upper valve with three scars, a large and small byssus muscle scar and a small adductor muscle scar; lower valve with a single adductor muscle scar. Periostracum: Obscure. Colour: White with pink, purple and beige zones showing when worn; lower valve white. Internal of both valves highly lustrous.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Anomioidea : Anomiidae
Listed are literature citing Anomia ephippium Linnaeus, 1758. Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
Winckworth, R I922. Note on the British species of Anomia. Proceedings of the Malacological Society of London. 15: 32-34.
Yonge C M 1977. Form and Evolution in the Anomiacea (Mollusca: Bivalvia)-- Pododesmus, Anomia, Patro, Enigmonia (Anomiidae): Placunanomia, Placuna (Placunidae Fam. Nov.). Philosophical Transactions of the Royal Society of London Series B. 276: 453-523.
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