Sunray Venus Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Macrocallista, Species: Macrocallista nimbosa · Veneridae (Venus clam family) · Bivalve (two-shelled clam), whole shell fragment, oval to elongate shape
Species
Macrocallista nimbosa
Shell Type
Bivalve (two-shelled clam), whole shell fragment, oval to elongate shape
Family
Veneridae (Venus clam family)
Size
Approximately 1 to 2 inches visible in current fragmented state; typical adults of this species range from 3 to 5 inches in length.
Color & Pattern
Pale cream or greyish-tan base with weathered surface, showing signs of sun-bleaching and erosion. Faint radial rays may be hinted at under magnification, but surface is largely worn.
Rarity
Common
Habitat
Found buried in sandy substrates in shallow marine waters, typically ranging from the intertidal zone down to shallow subtidal areas along high-energy sandy beaches.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina south through Florida and into the Gulf of Mexico.
Description
An oval-shaped bivalve shell fragment displaying heavy weathering and a matte, chalky texture. The exterior features faint radial growth lines characteristic of venerid clams, while the margins are worn smooth by wave action.
Key Features
Smooth, oval-elongate silhouette with fine concentric growth lines and a robust, heavy shell structure typical of the Venus clam family.
Collector Value
Low collector value due to heavy wear and fragmentation; typically collected as a casual beach souvenir rather than purchased by serious shell enthusiasts.
Condition Notes
Worn and sun-bleached with significant surface erosion and loss of original coloration; fair condition, suitable as a casual beach find rather than a collector-grade specimen.
Interesting Facts
Macrocallista nimbosa is one of the largest and most visually striking bivalves in its range when found fresh, known for its beautiful lavender-pink rays against an olive-tan background.
Ecological Role
Acts as a filter feeder in coastal marine ecosystems, helping to clear particulate matter from the water column while serving as a prey item for large marine predators and scavenging organisms.
Similar Species
Other large venerid clams such as the Sun ray Venus variants or hard shell clams (Mercenaria), which can be distinguished by heavier hinge teeth and distinct lunule/escutcheon markings.
Beach Finding Tips
Look along sandy ocean beaches after storms or heavy high tides, particularly near the surf line where shell debris accumulates.