Egg Cockle (also known as Strawberry Cockle or Prickly Cockle)
Phylum Mollusca, Class Bivalvia, Order Cardiida, Family Cardiidae, Genus Trachycardium, Species Trachycardium egmontianum · Cardiidae (Cockle family) · Bivalve (clam/two-shelled), whole shell, fan/heart-shaped morphology
Species
Trachycardium egmontianum
Shell Type
Bivalve (clam/two-shelled), whole shell, fan/heart-shaped morphology
Family
Cardiidae (Cockle family)
Size
Approximately 1 to 2 inches in length, which is average for this species. Adults typically range from 1 to 2.5 inches.
Color & Pattern
Uniform creamy white to pale yellowish coloration with prominent elevated radial ribs. The colors appear somewhat weathered and sun-bleached, typical of beach-worn specimens. The interior is smooth and matches the exterior pale tone.
Rarity
Common, frequently found by beachcombers in suitable regions of the southeastern United States and the Gulf of Mexico.
Habitat
Found in shallow marine waters, typically living buried just beneath the surface in sandy or muddy substrates, often in seagrass beds and protected bays from the intertidal zone down to moderate depths.
Geographic Range
Western Atlantic, specifically along the southeastern United States coastline, the Gulf of Mexico, and the Caribbean.
Description
A robust and attractive bivalve featuring strong, elevated radial ribs that create a deeply scalloped and serrated margin. The exterior showcases heavy sculptural ridges running from the umbo to the ventral margin, giving it a sturdy, corrugated appearance typical of the cockle family.
Key Features
Distinctive strong radial ribs with sharp scaly nodes or projections in pristine specimens, a heart-shaped cross-section when viewed from the side, and a strong, interlocking serrated margin.
Collector Value
Low to moderate collector value. While common and inexpensive, clean specimens with intact spines are popular among beginner beachcombers and shell crafters.
Condition Notes
Fair to Good condition. The shell appears worn and weathered with smoothed-down sculptural nodes from wave action, showing sun-bleaching, but remains structurally intact as a whole single valve.
Interesting Facts
Cockles are capable of a remarkable leaping locomotion using their muscular, hatchet-shaped foot to escape predators such as starfish and predatory snails.
Ecological Role
Plays an important role in benthic ecosystems as a filter feeder helping to clear the water column, and serves as a vital food source for numerous fish, rays, and carnivorous gastropods.
Similar Species
Magnum Cockle (Trachycardium magnum), which tends to be larger and less sharply sculptured, and the Yellow Cockle (Trachycardium muricatum), which features different color morphs and finer ribbing details.
Beach Finding Tips
Look along sandy Gulf and Atlantic beaches after strong storms or incoming high tides, particularly near tidal inlets and seagrass beds where whole valves wash ashore.