Acanthocardia tuberculata (Linnaeus, 1758)Cardioidea : Cardiidae
To size: To 95mm. Shell Structure: Robust. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just infront of midline. Tumidity: Inflated. Outline: Broadly oval posterior margin more straight than anterior. Contour: Umbonate.
Sculpture: 18-22 strong radial ribs, each carrying a row of nodules/blunt spines arising from the midline of the rib. In early stages, the small nodules are separated and only joined to each other by a narrow ridge. Later in growth on the anterior and middle area the nodules expand as bar shaped knobs the width of the whole rib; on the posterior the nodules develop as blunt spines. Overall with a distinct concentric rugose sculpture most prominent in interspaces. Margin: Deeply crenulated, interlocking ends of ribs and interspaces. Ligament: External, a prominent raised band set on a prominent nymph. Hinge: RV with 2 cardinals the posterior slightly the larger; 2 anterior and 1 posterior laterals: LV with 2 cardinals and single anterior and posterior laterals. Pallial Musculature: Pallial line entire. Periostracum: Thin. Colour: White, straw, chestnut and brown often in alternating broad concentric bands.
Distribution & Ecology
A southern species mostly recorded from the English Channel western approaches. Records from farther north are few and doubtful.
NBN records from Maureen Oilfield and Outer Hebrides may be erroneous.
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
Listed are literature citing Acanthocardia tuberculata (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
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