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 (two-shelled), whole shell, fan-shaped with radiating ribs
Species
Argopecten gibbus
Shell Type
Bivalve (two-shelled), whole shell, fan-shaped with radiating ribs
Family
Pectinidae (Scallop family)
Size
Approximately 0.75 inches in diameter, which is small to average for this individual specimen. Adults of this species typically range from 1 to 1.5 inches.
Color & Pattern
Predominantly white or creamy base with a distinct patch of warm orange-brown coloration concentrated near the hinge/umbo area. Faint radiating ribs are visible across the surface.
Rarity
Very Common
Habitat
Found in shallow marine waters, typically in sandy or shelly substrates, often associated with seagrass beds from the intertidal zone down to moderate depths.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through the Gulf of Mexico, Caribbean, and down to South America.
Description
A charming and compact bivalve, this small scallop features a classic fan-shaped profile with a slightly asymmetrical hinge area. The exterior showcases fine radiating ribs typical of the Pectinidae family, providing both structural strength and tactile texture. The specimen displays a clean white body accented by a distinct splash of orange-brown near the beak.
Key Features
Rounded fan shape, approximately equal-sized or slightly unequal auricles (ears) at the hinge, fine radiating ribs, and distinct coloration concentrated at the umbo.
Collector Value
Low to moderate value. While very common and frequently found by beachcombers, they are popular in crafts and beginner shell collections due to their appealing shape and cheerful colors.
Condition Notes
Good condition overall, intact single valve with minimal wear, slight fading and natural sun-bleaching characteristic of beach-worn specimens. Collectibility grade: Good.
Interesting Facts
Scallops are unique among bivalves because they are capable of swimming by rapidly clapping their valves together to expel water, propelled by a strong adductor muscle.
Ecological Role
Serves as an important food source for various marine predators including fish, rays, and sea stars. They filter organic particles from the water column, contributing to water clarity.
Similar Species
Atlantic Bay Scallop (Argopecten irradians), which tends to have a more circular outline and deeper ribs, and the Zigzag Scallop (Euvola ziczac), which is larger and flatter.
Beach Finding Tips
Look along high tide wrack lines on sandy Atlantic and Gulf beaches, especially after storms or during winter low tides when offshore shells are washed ashore.