Zigzag Scallop (also known as the Little Spectacle Scallop or Calico Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten gibbus · Pectinidae (Scallop family) · Bivalve (two-shelled), whole individual valve, fan or round disc shape
Species
Argopecten gibbus (or a closely related juvenile/small pectinid species)
Shell Type
Bivalve (two-shelled), whole individual valve, fan or round disc shape
Family
Pectinidae (Scallop family)
Size
Approximately 0.75 inches (1.9 cm) in width. This is on the smaller side, typical of juveniles or smaller adult specimens; adults of this species typically range from 1 to 2.5 inches.
Color & Pattern
Cream to white base color overlaid with prominent reddish-brown or orange zigzag patterns and broken flammules radiating from the umbo. Colors appear natural and vibrant with no heavy sun-bleaching.
Rarity
Common; frequently washes up on beaches throughout its native range, especially following storms.
Habitat
Shallow marine waters, ranging from the intertidal zone down to depths of about 150 feet, typically found resting on sandy bottoms, seagrass beds, and rubble areas.
Geographic Range
Western Atlantic Ocean, extending from North Carolina down through Florida, the Gulf of Mexico, the Caribbean, and south to Brazil.
Description
A charming and compact bivalve shell featuring a rounded, slightly inequilateral fan shape with well-defined radial ribs. The exterior showcases an intricate zigzag color pattern over a pale background. The surface is smooth yet textured with fine radial striations, and the umbo is prominent at the apex.
Key Features
Rounded fan shape, distinctive brownish-orange zigzag or flame patterns, well-developed radial ribs, and the classic asymmetrical auricles (ears) near the hinge typical of scallops.
Collector Value
Low to moderate commercial value due to commonness, but highly prized by amateur beachcombers for their bright, appealing patterns. Typically valued at under a dollar to a few dollars depending on size and perfection.
Condition Notes
Good condition with intact margins, clear coloration, and no major structural fractures. Graded as Good to Fine collector condition.
Interesting Facts
Scallops are unique among bivalves because they are capable of active swimming. By rapidly clapping their valves together, they expel water to jet-propel themselves away from predators like sea stars.
Ecological Role
Scallops serve as an important food source for various marine predators including fish, rays, sea stars, and octopuses. As filter feeders, they also help maintain water clarity by consuming suspended phytoplankton.
Similar Species
Atlantic Bay Scallop (Argopecten irradians), which tends to have a more rounded outline and slightly deeper ribs, and the Rough Scallop (Aequipecten muscosus), which features rougher, scaly ribs.
Beach Finding Tips
Look along high-tide wrack lines on sandy beaches of the southeastern United States and the Gulf of Mexico, particularly after strong offshore winds or storms.