Sunray Venus Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Macrocallista, Species: Macrocallista maculata · Veneridae (Venus clam family) · Bivalve, single valve, ovate-elliptical shape
Species
Macrocallista maculata
Shell Type
Bivalve, single valve, ovate-elliptical shape
Family
Veneridae (Venus clam family)
Size
Approximately 4 to 5 inches in length, which is on the larger end of average for this species. Adults typically range from 2.5 to 5 inches.
Color & Pattern
Cream to whitish base color adorned with distinctive reddish-brown or orange-brown rays radiating outward from the umbo toward the ventral margin. The umbo area exhibits a rich orange-peach patch. The colors are natural and slightly sun-bleached on the prominent exterior surfaces.
Rarity
Common
Habitat
Inhabits shallow subtidal waters down to moderate depths, typically burrowing in clean fine sand or sandy-mud substrates in marine environments.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through Florida, the Gulf of Mexico, the Caribbean Sea, and down to northern South America and Brazil.
Description
A sturdy, smooth, and glossy bivalve shell with an elongated oval outline. The exterior displays fine, concentric growth lines intersected by striking, vibrant brown or orange radial rays. The umbo is prominent, turned forward, and the margins are smooth without prominent teeth or heavy ridges, giving it a sleek and polished appearance.
Key Features
Smooth, polished exterior surface; prominent radiating color rays expanding from the umbo; ovate to elongated shape; well-defined concentric growth lines.
Collector Value
Low to Moderate. While widely collected and appreciated for its striking beauty, it is common enough that individual valves generally hold modest monetary value, usually ranging from a few dollars to $15 depending on size and color perfection.
Condition Notes
Good to Fine condition. The valve is intact with minimal edge wear, displaying strong natural color patterns around the umbo and faint radial rays across the body, with minor surface weathering.
Interesting Facts
The Sunray Venus is named for the distinctive colored rays that resemble the sun's rays at dawn or sunset. They are active burrowers using their muscular foot to quickly dig into the sand when threatened.
Ecological Role
Serves as an important benthic filter feeder, consuming microscopic plankton and organic particles, thus helping to maintain water clarity. They are preyed upon by carnivorous snails, rays, and bottom-dwelling fish.
Similar Species
Sunray Venus can sometimes be confused with other venerid clams like the Chione species, but those possess much heavier, rougher, and more pronounced concentric ribs and a lack of the smooth polished rayed pattern.
Beach Finding Tips
Look for single valves or paired shells washed up on high-energy sandy beaches after storms or heavy winds, particularly along the Gulf coast of Florida and Caribbean shores during low tide.