Atlantic Strawberry Cockle
Phylum: Mollusca, Class: Bivalvia, Order: Cardiida, Family: Cardiidae, Genus: Americardia, Species: Americardia media · Cardiidae (Cockle family) · Bivalve (two-shelled mollusk), fan/heart shaped single valve fragment.
Species
Americardia media
Shell Type
Bivalve (two-shelled mollusk), fan/heart shaped single valve fragment.
Family
Cardiidae (Cockle family)
Size
Approximately 25-30mm (1.1 inches) in width. This is a mature specimen; the species typically reaches 20-50mm.
Color & Pattern
Striking reddish-brown to orange-brown mottled patches over a creamy white or pale yellow base. The pattern often appears as broken bands or 'strawberry' spots, following the radial ribs. The interior is typically white with some of the exterior color showing through near the margins.
Rarity
Common. This species is frequently found on beaches in Florida and the Caribbean after storms or high tides.
Habitat
Shallow tropical marine waters, specifically in sandy substrates or near seagrass beds from the low tide mark down to approximately 20 feet of depth.
Geographic Range
Western Atlantic from North Carolina through the Florida Keys, the Gulf of Mexico, and throughout the Caribbean to the West Indies.
Description
A thick, solid, and inflated bivalve shell with a distinctive sub-quadrate (squarish) shape. The shell features approximately 33 to 36 strong, flattened radial ribs that are covered in fine, scale-like cross-ridges. The posterior end is vertically truncated, giving the shell a flat-backed appearance when viewed from the side.
Key Features
Square-like posterior margin (flat side), numerous prominent radial ribs with fine scales, and a distinct heart-shaped profile when both valves are held together.
Collector Value
Low to Moderate ($2 - $10 USD). While common, specimens with particularly bright red markings or paired 'double' valves in gem condition are highly desirable for decorative sets and biological collections.
Condition Notes
Fine condition. The edges show minor wear from surf action, but the color remains vivid and the rib structure is well-preserved. It is a single valve rather than a paired 'hinged' specimen.
Interesting Facts
Cockles are known as 'jumping' shells; they can use their strong, muscular, L-shaped foot to propel themselves across the seafloor to escape predators like starfish and snails. In some cultures, larger cockle species are a popular food source, though this species is primarily collected for its beauty.
Ecological Role
Suspension feeders that filter plankton and organic detritus from the water column. They help stabilize sandy substrates and serve as a vital food source for rays, large gastropods, and sea stars.
Similar Species
Yellow Cockle (Dasycardium muricatum) which has more prickly scales, and the Common Egg Cockle (Laevicardium laevigatum) which is much smoother and lacks the heavy ribbing.
Beach Finding Tips
Look for these along the wrack line after a strong onshore wind. They are most commonly found on the Gulf Coast of Florida and in the Bahamas. Their weight causes them to settle in 'shell pockets' near the tide line.