Checkered Cockle (also known as the Chequered Cockle)
Phylum: Mollusca, Class: Bivalvia, Order: Cardiida, Family: Cardiidae, Genus: Americardia, Species: Americardia media · Cardiidae (The Cockle family) · Bivalve (Single valve present); Shape: Sub-quadrate, heart-shaped when both valves are joined.
Species
Americardia media
Shell Type
Bivalve (Single valve present); Shape: Sub-quadrate, heart-shaped when both valves are joined.
Family
Cardiidae (The Cockle family)
Size
Approximately 20-25mm (0.8 - 1 inch). This is a mature specimen; the species typically ranges from 15mm to 50mm.
Color & Pattern
Creamy white base with distinct reddish-brown to orange-tan square or rectangular spots arranged in concentric bands across the ribs. The pattern appears natural and well-preserved.
Rarity
Common; found frequently on beaches throughout the Caribbean and Gulf of Mexico.
Habitat
Shallow tropical waters, typically in sandy substrates or seagrass beds from the intertidal zone to depths of about 60 meters. Marine environment.
Geographic Range
Western Atlantic: From Cape Hatteras, North Carolina, south through the Caribbean (including Cancun, Mexico) to Brazil.
Description
A sturdy, thick-walled bivalve characterized by a somewhat square or 'boxy' outline rather than a perfect circle. It features approximately 30-36 strong, scaly radial ribs. The posterior slope is flattened, giving it a truncated appearance on one side.
Key Features
Distinctively squared posterior end (the 'truncated' side) and the bold, checkered color blocks on the ribs. The interior usually has a faint yellow or orange tint.
Collector Value
Minimal monetary value (typically $1-$5), but highly desired by amateur collectors for its attractive geometric patterns and symmetrical shape.
Condition Notes
Good condition. The exterior sculpture is crisp, and the color pattern is vibrant. There is minor beach wear on the edges, and it appears to be a single valve rather than a paired set. Collectibility Grade: Fine.
Interesting Facts
Like most cockles, the living animal has a strong, L-shaped muscular foot that allows it to 'jump' across the seafloor to escape predators like sea stars.
Ecological Role
Suspension feeder that filters plankton from the water column. They serve as a food source for various fish, crabs, and gastropods like murex snails.
Similar Species
Americardia guppyi (Small Cockle), which is much smaller and has fewer ribs, and Trigoniocardia antillarum, which has a more triangular shape.
Beach Finding Tips
In Cancun, look in the 'wrack line' after a high tide. They are often found half-buried in the sand where waves have recently retreated. Best found after mild storms.
Notes
Cancun