Sunray Venus Clam (or Sunray Venus)
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Macrocallista, Species: Macrocallista nimbosa · Veneridae (Venus Clam family) · Bivalve (two-shelled clam), whole single valve, fan/oval shape
Species
Macrocallista nimbosa
Shell Type
Bivalve (two-shelled clam), whole single valve, fan/oval shape
Family
Veneridae (Venus Clam family)
Size
Approximately 4 inches in length, which is a medium-large size for this species. Adults typically range from 3 to 6 inches.
Color & Pattern
The exterior exhibits a chalky off-white or light cream base color with characteristic faint, pale brownish-orange or lavender-pink radial rays stretching from the umbo toward the margin. The specimen appears moderately sun-bleached with a worn outer layer.
Rarity
Common
Habitat
Found buried in fine sand or muddy sand in shallow subtidal waters, typically ranging from the low intertidal zone 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 into the Gulf of Mexico.
Description
An elegant, smooth, and elongated oval bivalve shell with a pointed beak (umbo). The surface features fine, concentric growth lines rather than heavy ribs, giving it a sleek appearance. The margin is smooth, and the overall form is streamlined to help the animal burrow efficiently in sandy marine substrates.
Key Features
Elongated oval-to-triangular shape, smooth glossy surface when fresh, prominent pointed umbo, and faint radial color bands (rays) running from the beak to the outer edge.
Collector Value
Low to Moderate commercial value due to commonness, but highly sought after by recreational beachcombers for display. Gem-quality specimens with intact bright coloration command higher appeal among amateur collectors.
Condition Notes
Fair to Good condition. The shell is intact as a single valve, but shows significant sun-bleaching, a chalky texture on the surface due to weathering, and worn margins with loss of the original glossy glaze and vibrant coloration.
Interesting Facts
The Sunray Venus is prized by beachcombers for its delicate pastel purple and brown rays. In life, the shell is covered by a thin, glossy periostracum that protects the vibrant colors underneath from fading.
Ecological Role
Functions as a filter feeder, helping to clear organic particles from the water column. Serves as a food source for various marine predators including carnivorous gastropods, rays, and fish.
Similar Species
Sunburst Dosinia (Dosinia elegans), which is rounder and more circular in outline compared to the elongated shape of the Sunray Venus.
Beach Finding Tips
Look along sandy Atlantic and Gulf Coast beaches, especially after storms or heavy wave action at low tide. Single valves wash ashore frequently in shell-rich drift lines.