Sunray Venus Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Macrocallista, Species: Macrocallista nimbosa · Veneridae (Venus clam family) · Bivalve (two-shelled), whole shell, fan/oval shape
Species
Macrocallista nimbosa
Shell Type
Bivalve (two-shelled), whole shell, fan/oval shape
Family
Veneridae (Venus clam family)
Size
Approximately 4 to 5 inches in length, which is average-to-large for this species. Adults typically range from 3 to 6 inches.
Color & Pattern
Pale creamy-white base coloration with delicate, faint pinkish or purplish rays radiating outward from the umbo toward the ventral margin. The interior is smooth and glossy white, sometimes showing faint purple tints.
Rarity
Common, frequently found washed up intact on southern U.S. beaches, especially after storms.
Habitat
Found buried in clean fine sand in shallow intertidal to subtidal waters, usually from the low tide mark down to depths of about 30 feet.
Geographic Range
Western Atlantic Ocean, primarily along the southeastern coast of the United States from North Carolina down through Florida, and extending into the Gulf of Mexico.
Description
An elegant, smooth, and solid bivalve shell with an elongated oval shape. The exterior features extremely fine, concentric growth lines that create a smooth, porcelain-like texture, crossed by attractive radiating color rays. The beaks (umbones) are located near the anterior end.
Key Features
Smooth, glossy porcelain-like exterior texture with distinctive radiating pink or purple rays on a light background, and an elongated oval profile with prominent, forward-pointing beaks.
Collector Value
Low to moderate commercial value. While widely collected and popular among beachcombers due to their large size and attractive coloration, they are too common for high-end collector pricing. Typically sold in tourist shell shops for a few dollars.
Condition Notes
The specimen appears to be in Good to Fine condition with intact margins, minimal weathering, and well-preserved natural color patterns.
Interesting Facts
The scientific species name 'nimbosa' means cloudy or stormy, likely referring to the cloudy, rayed color patterns on the shell. Live animals are active burrowers using a strong muscular foot.
Ecological Role
Functions as a filter feeder, helping to clear suspended organic particles from the water column. Serves as prey for various marine predators including large gastropods, rays, and crabs.
Similar Species
Sunray Venus can sometimes be confused with other venus clams like the Chione or Mercenaria species, but its smooth texture and distinctive radiating purple-pink rays immediately set it apart.
Beach Finding Tips
Look along sandy beaches in Florida and the Gulf coast following rough weather or high tides. Complete, paired valves are best found by wading in shallow sandbars.