Calico Scallop (Alternate names: Common American Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: A. gibbus · Pectinidae (Scallop family) · Bivalve, whole single valve, fan or disc-shaped
Species
Argopecten gibbus
Shell Type
Bivalve, whole single valve, fan or disc-shaped
Family
Pectinidae (Scallop family)
Size
Approximately 1 inch in diameter, which is average for this species. Adults typically range from 1 to 2.5 inches.
Color & Pattern
Vibrant yellowish-orange and golden-brown mottled patterns over a whitish base, arranged in irregular streaks and blotches radiating from the umbo. The colors are entirely natural and retain a glossy finish.
Rarity
Common
Habitat
Shallow marine waters to depths of around 150 feet, preferring sandy substrates and seagrass beds where they can rest or swim freely.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina south through the Florida Keys, the Gulf of Mexico, and the Caribbean Sea.
Description
An attractive, roughly symmetrical single valve of a Calico Scallop. It features fine, regular radial ribs running from the beak (umbo) to the evenly scalloped margin. The surface is smooth with a glossy sheen, displaying a striking pattern of warm golden-brown patches.
Key Features
Equilateral fan shape with well-defined radial ribs, characteristic symmetrical auricles (ears) at the hinge, and vibrant mottled coloration.
Collector Value
Low to moderate commercial value, though highly sought after by beachcombers for crafts and beginner collections due to their bright colors.
Condition Notes
Gem condition. The valve is completely intact with sharp margins, vibrant natural color, no fading, and no visible boring organism damage.
Interesting Facts
Unlike most bivalves that remain stationary, calico scallops can swim by rapidly snapping their valves together to expel water, allowing them to escape predators.
Ecological Role
Acts as an active filter feeder improving water clarity and serves as an important food source for fish, rays, sea turtles, and marine mammals.
Similar Species
Atlantic Bay Scallop (Argopecten irradians), which tends to have a flatter profile and slightly coarser ribs with fewer color variations.
Beach Finding Tips
Look along high-tide wrack lines on sandy ocean-facing beaches in Florida and the Carolinas, especially after storms or strong onshore winds.