Heart Cockle or Strawberry Cockle
Phylum: Mollusca, Class: Bivalvia, Order: Cardiida, Family: Cardiidae, Genus: Corculum, Species: Corculum cardissa · Cardiidae (Cockle family) · Bivalve (two-shelled), whole shell, heart-shaped disc
Species
Corculum cardissa (most likely) or similar cardiid species
Shell Type
Bivalve (two-shelled), whole shell, heart-shaped disc
Family
Cardiidae (Cockle family)
Size
Approximately 1 to 1.5 inches, which is standard for many smaller heart cockle species. Adults typically range from 1 to 2 inches.
Color & Pattern
Pale creamy white to light beige with subtle hints of pink or orange near the umbo and hinge area. Colors appear somewhat sun-bleached due to beach exposure, showing a matte finish.
Rarity
Common to Uncommon depending on the specific beach location within its Indo-Pacific range, though whole undamaged specimens are prized finds.
Habitat
Shallow subtidal waters down to moderate depths, living buried in clean sand or sandy-mud substrates in tropical marine environments, often associated with coral reef ecosystems.
Geographic Range
Indo-Pacific region, spanning from the Red Sea and East Africa across the Indian Ocean to Southeast Asia, Indonesia, and tropical Australia.
Description
A charming and distinctively heart-shaped bivalve shell with pronounced radial ribs and concentric growth lines. When viewed from the side, it is notably compressed laterally, showcasing its symmetrical heart silhouette with a serrated margin.
Key Features
Unmistakable heart-shaped (cordate) profile when viewed from the anterior or posterior, prominent radial ribs, and compressed lateral flattening.
Collector Value
Low to moderate commercial value, but highly desirable for recreational beachcombers and shell collectors due to its pleasing, symmetrical heart shape.
Condition Notes
Fair to Good condition. Shows signs of mild beach wear, slight sun-bleaching, and minor edge abrasion, but the overall form and structural integrity remain intact.
Interesting Facts
Many species in the family Cardiidae possess tiny siphons that allow them to filter feed while buried just beneath the sand. Some tropical cockles even harbor symbiotic algae (zooxanthellae) within their translucent shell windows to photosynthesize.
Ecological Role
Serves as an important prey item for various marine carnivores including gastropods, fish, and crustaceans. Contributes to benthic bioturbation through burrowing activities.
Similar Species
Other members of the Cardiidae family such as Fragum species (strawberry cockles), which share the heart shape but often feature brighter red or pink coloration and more pronounced nodules.
Beach Finding Tips
Look along tropical Indo-Pacific sandy beaches, especially after storms or high tides. Sift gently through shell drift lines where smaller bivalves accumulate.