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 (two-shelled), whole valve, fan/heart-shaped
Species
Trachycardium egmontianum
Shell Type
Bivalve (two-shelled), whole valve, fan/heart-shaped
Family
Cardiidae (Cockle family)
Size
Approximately 1 to 1.5 inches in width, which is average for this species. Adults typically range between 1 and 2 inches.
Color & Pattern
Warm yellow to orange-brown base coloration with darker brownish spots and mottling along the radiating ribs. Colors appear natural and slightly weathered with no signs of artificial alteration.
Rarity
Common
Habitat
Shallow marine waters, typically found burrowed just beneath the surface in sandy or muddy substrates, often in seagrass beds from the intertidal zone to shallow subtidal depths.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina down through Florida, the Gulf of Mexico, and the Caribbean Sea.
Description
A sturdy, compact bivalve shell featuring prominent radiating ribs that are adorned with distinct scale-like or prickly spines, creating a rough texture. The margin is deeply scalloped, matching the exterior ribbing pattern, and the overall shape is robust and heart-like when both valves are joined.
Key Features
Distinctive radiating ribs (typically around 30 to 35) with sharp, prickly scales or nodes along the ridges, and a distinctly rounded to slightly oblique fan-like profile.
Collector Value
Low to moderate commercial value. While very popular among beginner beachcombers and casual collectors for their attractive colors and tactile texture, they are abundant enough that they are rarely expensive.
Condition Notes
Single valve in good condition. Shows minor natural weathering and slight smoothing on the prominent ribs, but retains most of its original coloration and structural integrity. Grade: Good.
Interesting Facts
Cockles are capable of escaping predators by using their strong, muscular foot to leap or flip away from danger. They breathe and feed by extending short siphons above the sand while remaining buried.
Ecological Role
Serves as an important prey species for various marine carnivores including predatory gastropods, fish, and shorebirds. As filter feeders, they help clean coastal waters by consuming suspended microalgae and organic particles.
Similar Species
Giant Atlantic Cockle (Dinocardium robustum), which is significantly larger and generally lacks the intensely prickly ribs of the Egg Cockle, and the Magnum Cockle (Trachycardium magnum), which has flatter ribs.
Beach Finding Tips
Look along sandy ocean-facing beaches after storms or heavy wave action, particularly at low tide. Search the wrack line where light shells wash ashore, or gently sift through wet sand in the surf zone.