Calico Scallop (also known as the Atlantic Calico Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten gibbus · Pectinidae (Scallop family) · Bivalve (two-shelled), whole shell, fan-shaped with asymmetrical auricles (ears) at the hinge
Species
Argopecten gibbus
Shell Type
Bivalve (two-shelled), whole shell, fan-shaped with asymmetrical auricles (ears) at the hinge
Family
Pectinidae (Scallop family)
Size
Approximately 1.5 to 2 inches in width and length, which is a very typical size for an adult specimen of this species. Adults generally range from 1 to 2.5 inches.
Color & Pattern
Vibrant patterns of mottled reddish-pink, white, and brownish-orange splashes radiating from the umbo toward the outer margin. The colors are entirely natural and vivid, showcasing distinct radial ribs.
Rarity
Common, frequently found washed up on beaches throughout its range, particularly along the Gulf and Atlantic coasts of Florida.
Habitat
Shallow marine waters, typically found in sandy or shelly substrates, often in seagrass beds or open sandy patches from the intertidal zone down to depths of about 150 feet.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina down through Florida, the Gulf of Mexico, and the Caribbean Sea.
Description
A charming and brightly colored bivalve featuring a classic fan shape with strongly defined, rounded radial ribs. The umbo is narrow and pointed, showcasing a deep purple-pink tint, while the distinct asymmetrical "ears" or auricles flank the hinge line, with one side noticeably elongated.
Key Features
Rounded radial ribs (typically around 18-20), unequal auricles (ears) at the hinge with one side noticeably larger than the other, and a mottled, colorful pattern of pink, red, and white.
Collector Value
Low to moderate commercial value, but highly popular among casual beachcombers and crafters. Specimens with exceptional coloration or pristine double-valved sets are prized by amateur shell collectors, usually valued at just a few dollars.
Condition Notes
Fine to Gem condition. The shell is intact with minimal wear, retaining its vibrant natural coloration and sharp, well-defined ribs. There are no major chips on the margin, though minor sand granules remain nestled in the interstices.
Interesting Facts
Unlike many bivalves that burrow and stay put, calico scallops are capable of swimming by rapidly snapping their valves together to expel water, allowing them to escape predators like starfish and crabs.
Ecological Role
Scallops serve as an important food source for numerous marine predators including sea stars, rays, octopuses, and carnivorous gastropods. They are filter feeders that help clear particulate matter from the water column.
Similar Species
Bay Scallop (Argopecten irradians), which tends to be slightly more rounded with fewer, broader ribs and a more northern distribution.
Beach Finding Tips
Look along high-tide wrack lines on sandy Florida beaches, especially after storms or strong onshore winds. Calm mornings following a high tide often yield the best intact specimens.