Common Cockle, European Cockle
Phylum: Mollusca, Class: Bivalvia, Order: Cardiida, Family: Cardiidae, Genus: Cerastoderma, Species: C. edule · Cardiidae (Cockle or Heart Clam family) · Bivalve (specifically a single left or right valve); Heart-shaped/Oval
Species
Cerastoderma edule
Shell Type
Bivalve (specifically a single left or right valve); Heart-shaped/Oval
Family
Cardiidae (Cockle or Heart Clam family)
Size
Estimated at 3.5–4.5 cm in width. This fall within the average adult size range of 3 to 5 cm.
Color & Pattern
Pale off-white to yellowish-cream base with subtle brownish-orange concentric bands and flecks. The pigment is concentrated on the ridges. The shell appears somewhat weathered, indicating it is a beach-worn specimen rather than a live-taken one.
Rarity
Very Common
Habitat
Found in the intertidal and shallow subtidal zones, typically burrowed in sandy, muddy, or gravelly substrates of bays and estuaries.
Geographic Range
Common along the coastlines of the Northeast Atlantic, from Iceland and Norway down to Senegal, including the North Sea and the British Isles.
Description
A sturdy, rounded bivalve with roughly 22 to 28 prominent radiating ribs. These ribs are crossed by fine concentric growth lines, giving the surface a slightly rugose or bumpy texture. When both valves are joined, the shell has a distinctive heart-shaped profile when viewed from the side.
Key Features
Prominent radial ribs (approx. 24), rounded-quadrate shape, crenulated (scalloped) margins where the ribs meet the edge, and a strong external ligament (not visible here).
Collector Value
Minimal monetary value ($0.50 - $2.00) due to high abundance. It is highly desirable for beginners or for decorative 'shell craft' due to its classic symmetrical aesthetic.
Condition Notes
Good beach-found condition. The margins are relatively intact, though the surface shows light erosion from sand and surf. There are no visible predatory drill holes. Collectibility Grade: Good/Fair.
Interesting Facts
Cockles are capable of 'jumping' to escape predators like starfish by using their powerful, L-shaped muscular foot. They have been a staple seafood in Europe for centuries, particularly in Wales and the Netherlands.
Ecological Role
Suspension feeders that filter organic particles from the water, playing a crucial role in water clarity and serving as a primary food source for oystercatchers, flatfish, and crabs.
Similar Species
Cerastoderma glaucum (Lagoon Cockle), which is more elongated and prefers lower salinity; Acanthocardia echinata (Prickly Cockle), which has sharp spines on the ribs.
Beach Finding Tips
Look in the 'wrack line' after a receding tide in sandy estuaries. They are often found in vast numbers after winter storms. Look for the distinctive 'heart' shape in the sand.