Cockle Shell (Heart Cockle / Strawberry Cockle)
Phylum: Mollusca, Class: Bivalvia, Order: Cardiida, Family: Cardiidae, Genus: Trachycardium, Species: Trachycardium egmontianum · Cardiidae (Cockle family) · Bivalve (two-shelled), whole valve, fan/heart shape
Species
Trachycardium egmontianum (Prickly Cockle) or general Fulvia/Dinocardium species
Shell Type
Bivalve (two-shelled), whole valve, fan/heart shape
Family
Cardiidae (Cockle family)
Size
Approximately 1.5 to 2 inches in width, which is average for this group of cockles. Adults typically range from 1 to 3 inches.
Color & Pattern
The exterior features an artificial or heavily modified metallic gold finish infused with glitter, completely masking the natural coloration underneath. Typically, natural specimens exhibit shades of white, cream, brown, or reddish-pink with radial patterns.
Rarity
Very Common in nature, though this specific specimen is modified/craft-altered.
Habitat
Shallow marine waters, primarily inhabiting sandy or muddy substrates in intertidal to subtidal zones down to moderate depths.
Geographic Range
Species within the Cardiidae family are globally distributed in tropical and temperate seas; specifically, western Atlantic species range from North Carolina through the Caribbean and Gulf of Mexico.
Description
This is a single bivalve valve characterized by a rounded, heart-shaped profile when viewed from the side, featuring prominent, well-defined radial ribs radiating from the umbo to the ventral margin. The surface has been artificially coated with a glittering gold lacquer, obscuring the natural texture and pigmentation.
Key Features
Rounded to sub-quadrate asymmetrical outline, prominent central umbo (beak), and strong, regular radial ribs running from the hinge to the outer margin.
Collector Value
Low to none for serious conchologists due to the artificial modification (painting/glittering). These are typically used for decorative or craft purposes rather than natural history collections.
Condition Notes
The underlying shell appears structurally intact, but the specimen has been heavily altered with craft paint and glitter, reducing its scientific and natural collector value to a poor or altered grade.
Interesting Facts
Cockles use a strong, muscular, hatchet-shaped foot to burrow into the sand and can even leap or flip themselves backward to escape predators like starfish.
Ecological Role
Cockles serve as an important food source for many marine predators, including gastropods, fish, and shorebirds, and act as filter feeders that help maintain water clarity.
Similar Species
Other members of the Cardiidae family such as the Giant Atlantic Cockle (Dinocardium robustum) or Strawberry Cockle (Fragum unedo), distinguished by rib count and natural coloration.
Beach Finding Tips
Look along sandy beaches at low tide, particularly after storms when shifting sands unearth buried bivalves. Whole paired valves can often be found by searching the wrack line.