Calico Scallop (also known as the Little Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten gibbus · Pectinidae (Scallop family) · Bivalve, single valve, fan or disc-shaped
Species
Argopecten gibbus
Shell Type
Bivalve, single valve, fan or disc-shaped
Family
Pectinidae (Scallop family)
Size
Approximately 1 inch in diameter, which is typical for an average adult specimen. Maximum size for the species reaches about 1.5 to 2 inches.
Color & Pattern
Vibrant and highly variable calico pattern featuring mottled splashes and chevrons of reddish-brown, orange, and purple on a cream-to-white base. The colors are entirely natural and glossy.
Rarity
Common, frequently washed up on beaches throughout its native range, especially following storms.
Habitat
Shallow marine waters, typically found in offshore beds on sandy or shelly substrates, ranging from just below the low tide line down to depths of about 150 feet.
Geographic Range
Western Atlantic Ocean, from North Carolina southward through the Florida Keys, the Gulf of Mexico, and the Caribbean Sea.
Description
A charming, small bivalve shell featuring a classic rounded fan shape with prominent, evenly spaced radial ribs and slightly unequal auricles (ears) at the hinge. The margin is scalloped and wavy, perfectly matching the exterior ribs. Its glossy texture and striking calico markings make it a delightful addition to any collection.
Key Features
Symmetrical fan shape with roughly 18 to 23 prominent, rounded radial ribs, unequal hinge ears, and the characteristic multicolored mottled calico pattern.
Collector Value
Low to moderate individual value, but highly sought-after by casual beachcombers and crafters. Specimens with exceptionally bright purple or pink hues command slightly higher interest.
Condition Notes
Good overall condition as a single valve with intact margins and vibrant, unfaded coloration. Minor natural wear on the umbo but strong collectibility grade of Fine.
Interesting Facts
Unlike many bivalves, calico scallops are capable of swimming by rapidly clapping their valves together to expel water, allowing them to escape predators like starfish and rays.
Ecological Role
Serves as an important prey item for various fish, crabs, and sea stars. They are filter feeders that help maintain water clarity by consuming suspended phytoplankton and organic particles.
Similar Species
Atlantic Bay Scallop (Argopecten irradians), which tends to be slightly larger with flatter ribs and is generally found in shallower seagrass beds rather than deeper offshore waters.
Beach Finding Tips
Look along high tide wrack lines on Gulf and Atlantic beaches of Florida, especially after winter storms or heavy winds. Sifting through shell piles near inlets often yields whole valves.