Atlantic Winged Oyster / Atlantic Pearl Oyster (also known as Pteria colymbus)
Phylum: Mollusca, Class: Bivalvia, Order: Pteriida, Family: Pteriidae, Genus: Pteria, Species: Pteria colymbus · Pteriidae (Pearl Oyster family) · Bivalve, whole shell, asymmetrical fan/wing shape
Species
Pteria colymbus
Shell Type
Bivalve, whole shell, asymmetrical fan/wing shape
Family
Pteriidae (Pearl Oyster family)
Size
Approximately 1.5 to 2 inches in length, which is typical for a young to medium-sized specimen of this species. Adults can reach up to 3 to 4 inches.
Color & Pattern
Displays a mottled coloration ranging from pale yellowish-brown near the umbo to dark brownish-grey and bluish-black towards the ventral margin, with natural radial patterns and fine growth lines.
Rarity
Common in areas where sea whips and gorgonians thrive, but entire beach-worn valves can be occasionally found washed ashore.
Habitat
Found attached by a byssus to gorgonians (sea whips and sea fans), corals, or hard substrates in shallow marine waters, typically subtidal zones down to moderate depths.
Geographic Range
Western Atlantic Ocean, including North Carolina, Florida, the Gulf of Mexico, the Caribbean Sea, and down to South America and Brazil.
Description
An asymmetrical bivalve shell characterized by an oblique, elongated wing-like extension along the hinge line. The surface features fine radiating ribs and concentric growth lines, presenting a rugged yet delicate pearlescent structure.
Key Features
Elongated posterior 'wing', asymmetrical valves with a distinct beak (umbo) near the anterior end, and attachment notch for a byssus.
Collector Value
Low to moderate value. Commonly kept by casual beachcombers and specialized bivalve collectors, typically valued at a few dollars unless exceptionally large or pristine.
Condition Notes
Good condition with natural weathering. Some minor dullness and slight darkening from age, but structural integrity is intact with well-preserved radial ribs. Grade: Good.
Interesting Facts
Members of the Pteriidae family are well-known for their ability to produce pearls, though Pteria colymbus pearls are typically small and of lesser commercial value compared to larger pearl oysters.
Ecological Role
Acts as a filter feeder helping to clear the water column, and provides microhabitats for various small marine invertebrates among its shell crevices and byssal attachment.
Similar Species
Atlantic Pearl Oyster (Pteria sterna) found in the Eastern Pacific, which tends to have slightly different color hues and geographic distributions.
Beach Finding Tips
Look near drift lines on beaches adjacent to coral reefs, seagrass beds, or areas with abundant sea whips and gorgonians after storms.