Heteranomia squamula (Linnaeus, 1758)
Anomioidea : Anomiidae
To size: To 15 mm. Shell Structure: Upper valve thin but robust, lower valve thinner often hyaline. Equivalve: Inequivalve, upper (left) valve convex; lower (right valve) flat. Equilateral: Inequilateral, beaks close to the middle of the dorsal margin. Outline: Upper subcircular but often very irregular and taking outline of substrate; lower valve similar with an oval byssus foramen. Contour: Often deformed to fit shape of attachment area.
Sculpture: Upper valve surface variable from almost smooth with concentric lines to bearing fluted spines; lower valve 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 two scars the dorsal (byssus retrator) larger and joined with the smaller single adductor scar. Scars without faint radiating furrows. Lower valve with a single faint adductor scar. Periostracum: Obscure. Colour: Both valves white often semitransparent. Additional Characters: Anatomy: Ctendium with non-reflected filaments.
Distribution & Ecology
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Anomioidea : Anomiidae
Listed are literature citing Heteranomia squamula (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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