Calico Scallop (Scallop fragment)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten gibbus · Pectinidae (Scallop family) · Bivalve (two-shelled mollusk fragment). Shape: Fan-shaped / triangular sector.
Species
Argopecten gibbus (likely based on fan shape, radial ribbing, and reddish coloration)
Shell Type
Bivalve (two-shelled mollusk fragment). Shape: Fan-shaped / triangular sector.
Family
Pectinidae (Scallop family)
Size
Approximately 1 to 1.5 inches in width. Complete adult shells typically range from 1.5 to 3 inches in diameter.
Color & Pattern
Creamy white to light yellow base color with distinct reddish-brown, maroon, or pinkish pigmentation along the outer crenellated margin and radial ribs.
Rarity
Very Common (as a shell fragment)
Habitat
Subtidal ocean environments, typically found on sand, shell hash, or gravel substrates at depths ranging from 10 to 100 meters.
Geographic Range
Western Atlantic, extending from North Carolina south through the Gulf of Mexico, Florida, and the Caribbean.
Description
A broken wedge-shaped section of a bivalve valve displaying prominent radial ribs and strong marginal scalloping. The exterior surface exhibits strong fan-like fluting typical of pectinids, fading into a worn, cream-colored umbonal area.
Key Features
Distinct regular radial ribs terminating in scalloped edges, fan-like radiating pattern, triangular sector shape indicative of a broken scallop valve, and reddish-brown marginal banding.
Collector Value
Low collectible value due to incomplete fragment state. Intact specimens with rich coloration and intact auricles hold modest value for shell enthusiasts.
Condition Notes
Fair to Poor (Fragmentary). Missing ears (auricles), hinge line, and a large portion of the complete valve. Weathered finish with worn surface detail.
Interesting Facts
Scallops are active swimmers, propelling themselves through the water by rapidly clapping their valves together. They also possess dozens of tiny blue eyes along the mantle edge to detect light and movement.
Ecological Role
Benthic filter feeder that removes plankton and suspended organic matter from the water column, aiding water clarity and serving as prey for sea stars, crabs, and bottom-dwelling fish.
Similar Species
Atlantic Bay Scallop (Argopecten irradians) - usually has greyish/brownish coloration; Rough Scallop (Aequipecten muscosus) - features spiny or rougher ribbing.
Beach Finding Tips
Look along high-tide debris lines and shell mounds after storms or strong onshore winds, particularly along sandy beaches in Florida and the U.S. Southeast coast.