Sunray Venus Clam (alternatively known as the Sunray Venus)
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Macrocallista, Species: Macrocallista nimbosa · Veneridae (Venus clam family) · Bivalve, whole single valve, fan/oval shape
Species
Macrocallista nimbosa
Shell Type
Bivalve, whole single valve, fan/oval shape
Family
Veneridae (Venus clam family)
Size
Approximately 3 to 4 inches in length, which is average for an adult specimen of this species. Full-grown adults typically range from 3 to 5 inches.
Color & Pattern
This particular specimen exhibits a muted, weathered brownish-tan base color with concentric growth lines. The characteristic faint lavender or purplish rays of the species are largely faded due to sun-bleaching and wear. The interior is not visible in the photograph.
Rarity
Common; frequently washed up on beaches throughout its native range after storms or rough surf.
Habitat
Ininhabits shallow subtidal waters and intertidal zones, typically burrowing just beneath the surface in clean sandy bottoms, sandbars, and seagrass beds in marine environments.
Geographic Range
Western Atlantic Ocean, primarily along the southeastern coast of the United States from North Carolina down to Florida and into the Gulf of Mexico.
Description
An attractive, sturdy, smooth-textured bivalve shell with prominent concentric growth lines. The overall shape is elongate-oval with a prominent, curved umbo pointing toward the anterior. While fresh specimens display striking lavender-pink rays against a cream background, this beach-worn example shows classic signs of weathering with a soft tan patina and minor surface pitting.
Key Features
Elongate-oval outline, smooth porcelain-like texture when fresh, prominent concentric growth ridges, and an umbo located near the anterior end. Distinguished by its overall sleek profile compared to heavier, more rounded clams.
Collector Value
Low to Moderate monetary value as they are quite common. Pristine, gem-quality specimens with intact bright rays and matching double valves are more desirable to advanced collectors, while beach-worn singles are generally used for crafts or casual collections.
Condition Notes
Fair to Good condition for a beach-combed specimen. The shell is structurally intact as a single valve, but shows clear signs of weathering, sun-bleaching, and minor small boring sponge or predator holes on the surface. Collectibility grade is Good.
Interesting Facts
The Sunray Venus is prized for its remarkable symmetry and the subtle beauty of its violet-pink sunburst rays. The living clam uses a muscular foot to rapidly burrow into the sand when disturbed.
Ecological Role
Functions as a filter feeder, helping to clear particulate matter from the water column. Serves as an important food source for marine predators including fish, rays, and carnivorous sea snails. Not currently endangered or heavily regulated.
Similar Species
Other members of the Veneridae family such as the Channeled Duck Clam or Sun Ray variants, but Macrocallista nimbosa is easily identified by its distinctively elongated shape and fading purple rays.
Beach Finding Tips
Look along sandy Gulf and Atlantic beaches of Florida and the Southeast, particularly at low tide or immediately following a strong offshore storm when heavy surf uncovers buried bivalves.