Atlantic Bay Scallop (Orange variant)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten irradians · Pectinidae (Scallop family) · Bivalve (single valve shown, fan-shaped shell)
Species
Argopecten irradians
Shell Type
Bivalve (single valve shown, fan-shaped shell)
Family
Pectinidae (Scallop family)
Size
Approximately 1.5 to 2.5 inches (3.8-6.3 cm) in width. Standard adult size ranges from 1.5 to 3 inches.
Color & Pattern
Vibrant golden-orange to amber hue across the entire exterior valve, with lighter, warm cream undertones visible along the radial ribs and growth lines. The color appears natural and well-preserved.
Rarity
Uncommon (in bright orange coloration). Standard gray/brown bay scallops are Very Common, but solid bright orange or yellow color morphs are sought after and found less frequently.
Habitat
Subtidal coastal waters, shallow bays, estuaries, and eelgrass beds (Zostera marina) at depths from 1 to 30 feet in marine environments.
Geographic Range
Western Atlantic coast of North America, ranging from Cape Cod, Massachusetts south to Florida and the Gulf of Mexico.
Description
A classic fan-shaped bivalve single valve featuring prominent, evenly spaced radial ribs extending from the umbo (beak) to the scalloped outer margin. The shell displays a brilliant bright orange hue, characteristic of desirable color morphs within the Pectinidae family.
Key Features
Fan-shaped symmetrical valve, 18-22 rounded radial ribs radiating outward, distinct ears/auricles at the hinge, and vibrant solid orange color variation.
Collector Value
Low to moderate ($3 - $15 USD). Standard Bay Scallops hold little monetary value, but bright orange, yellow, or calico color variations are popular among beachcombing collectors.
Condition Notes
Good condition. The exterior sculpture and bright natural color are intact, though fine surface erosion is consistent with beach-found specimens. The margins appear relatively complete with minor wear along the edges.
Interesting Facts
Scallops possess up to 100 simple blue eyes (ocelli) along the edge of their mantle that detect movement and light changes. Unlike most bivalves, they can swim actively by rapidly clapping their valves together.
Ecological Role
Benthic suspension filter-feeders that improve water clarity by consuming microalgae and plankton. They serve as a key food source for sea stars, crabs, rays, and shorebirds.
Similar Species
Calico Scallop (Argopecten gibbus) - typically has motley, spotted reddish patterns on a lighter background; Rough Scallop (Euvola ziczac) - distinct unequal valves and flatter profile.
Beach Finding Tips
Look along bay beaches, shallow estuarine shorelines, and tidal flats after strong winter storms or at extreme low tide near eelgrass beds.