Atlantic Calico Scallop (Calico Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten gibbus · Pectinidae (Scallop family) · Bivalve, single valve, fan shape
Species
Argopecten gibbus
Shell Type
Bivalve, single valve, fan shape
Family
Pectinidae (Scallop family)
Size
Approximately 1.5 inches in width and length, which is average for this species. Adults typically range from 1 to 2.5 inches.
Color & Pattern
Mottled pattern of brownish-orange and white streaks and flecks radiating from the umbo toward the ventral margin. The colors appear entirely natural and well-preserved.
Rarity
Common
Habitat
Shallow subtidal marine environments, typically found on sandy or shelly substrates in clear waters, often in seagrass beds or offshore scallop beds.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through Florida, the Gulf of Mexico, and the Caribbean Sea.
Description
A classic fan-shaped bivalve shell with strong, prominent radial ribs and symmetrical auricles (ears) at the hinge line. The exterior features a textured, ribbed surface with charming calico color splashes, while the margin is scalloped to match the internal ribbing.
Key Features
Symmetrical fan shape, prominent equal-sized ears at the hinge, strong radial ribs, and a distinctive mottled calico color pattern.
Collector Value
Inexpensive and widely available, making it a favorite for beginners and crafters, though high-color or perfect double-valve specimens are prized by casual collectors.
Condition Notes
Very good condition, intact single valve with vibrant natural colors, minimal wear, and a clean exterior. Collectibility grade: Fine to Gem.
Interesting Facts
Unlike many bivalves, calico scallops are capable of swimming short distances by rapidly clapping their valves together to expel water, helping them escape predators like sea stars.
Ecological Role
Serves as an important food source for various marine predators including fish, rays, and sea stars. They are filter feeders that help maintain water clarity in coastal ecosystems.
Similar Species
Atlantic Bay Scallop (Argopecten irradians), which tends to be slightly more rounded with fewer ribs and a different geographical or ecological preference.
Beach Finding Tips
Look along drift lines on ocean-facing sandy beaches after storm events or high tides, especially in the southeastern United States and Gulf Coast.