Edible Cockle (Common Cockle)
Phylum: Mollusca, Class: Bivalvia, Order: Cardiida, Family: Cardiidae, Genus: Cerastoderma, Species: Cerastoderma edule · Cardiidae (Cockle family) · Bivalve, whole shell, heart-shaped when viewed from the side, inflated rounded form
Species
Cerastoderma edule
Shell Type
Bivalve, whole shell, heart-shaped when viewed from the side, inflated rounded form
Family
Cardiidae (Cockle family)
Size
Approximately 1.5 inches in width, which is average for an adult of this species. Adults typically range from 1 to 2 inches.
Color & Pattern
Off-white to cream base color with faint brownish or yellowish patches near the margins, showing signs of sun-bleaching. The exterior texture features prominent radial ribs creating a textured surface.
Rarity
Very Common, frequently found washed ashore on European beaches.
Habitat
Found in intertidal zones and shallow subtidal waters down to a few meters depth. Prefers sandy or muddy sand substrates, often buried just beneath the surface in estuaries, bays, and protected shores. Marine to brackish environment.
Geographic Range
Northeast Atlantic Ocean, extending from the Norwegian Sea and British Isles down to the coast of West Africa, including the Mediterranean Sea and Baltic Sea.
Description
A robust, rounded, heart-shaped bivalve shell featuring strong, prominent radial ribs and concentric growth lines that create a distinct checkered or reticulated texture. The margin is heavily toothed to interlock tightly with the opposing valve.
Key Features
Strong, prominent radial ribs (usually around 22 to 28), inflated rounded shape, and symmetrical equivalve structure with a distinct heart-shaped profile when viewed end-on.
Collector Value
Low to moderate commercial value due to high abundance, but a staple species for beginner shell collections. Typically sold inexpensively in bulk or as part of craft assortments.
Condition Notes
Good condition for a beach-worn specimen. Shows some sun-bleaching and minor wear along the edges, but the sculptural ribs and overall structural integrity remain intact. Collectibility grade: Good.
Interesting Facts
Cockles are capable of leaping using their muscular foot to escape predators like starfish. They are also commercially harvested as an important seafood delicacy in Europe.
Ecological Role
Act as important filter feeders helping to clear coastal waters. They serve as a vital food source for shorebirds, fish, and crabs. Populations are generally stable and managed through fisheries regulations.
Similar Species
Lagoon Cockle (Cerastoderma glaucum) and Spiny Cockle (Acanthocardia tuberculata). Distinguished by rib count, shape, and spine development.
Beach Finding Tips
Look along intertidal mudflats, sandy bays, and strandlines after high tide or storms in European coastal regions. Look for small keyhole-like siphon holes in the sand at low tide.