Smooth Dosinia or White Venus Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Dosinia, Species: Dosinia lupinus · Veneridae (Venus Clam family) · Bivalve, whole shell with a rounded to slightly sub-quadrate fan shape
Species
Dosinia lupinus
Shell Type
Bivalve, whole shell with a rounded to slightly sub-quadrate fan shape
Family
Veneridae (Venus Clam family)
Size
Approximately 0.75 inches (2 cm) in width, which is average for this smaller venus clam species. Adults typically range between 0.7 to 1.5 inches.
Color & Pattern
Chalky white to creamy off-white base color with a distinctive dark purplish-brown umbo (beak) area. The surface is mostly matte and natural, showing clear concentric growth lines without intricate color patterns.
Rarity
Common
Habitat
Found buried in fine sand or muddy sand substrates in shallow marine waters, ranging from the intertidal zone down to moderate depths of several dozen meters.
Geographic Range
Eastern Atlantic Ocean, including the Mediterranean Sea, the coast of Western Europe, and British waters.
Description
A charming, compact bivalve shell featuring a smooth, rounded outline with prominent, regular concentric growth rings wrapping gracefully around the valve. The most striking visual feature is the dark brownish-purple coloration concentrated at the umbo, contrasting sharply with the clean, milky white body of the shell.
Key Features
Rounded, compressed disc shape, prominent concentric sculptural ridges, and a distinct dark umbo contrasting against a white or cream background.
Collector Value
Low to moderate value. While very pretty and appealing to casual beachcombers, they are common enough that individual valves have little commercial value, usually valued as a nice representative study specimen for a shell collection.
Condition Notes
Good condition. Appears to be a single valve (half of a bivalve), intact with no visible cracks, major chips, or predatory boring holes. The color is natural with some minor surface weathering.
Interesting Facts
Venus clams are burrowing bivalves that use a muscular foot to dig rapidly into the sand when threatened. Their concentric growth rings can sometimes be used to estimate the age of the individual specimen.
Ecological Role
As suspension feeders, venus clams filter phytoplankton and organic particles from the water column, helping to maintain water clarity. They serve as an important food source for bottom-feeding fish, rays, and carnivorous gastropods.
Similar Species
Other members of the Dosinia genus, such as the Northern Dosinia (Dosinia exoleta), which tends to be larger with slightly more pronounced concentric ribbing.
Beach Finding Tips
Look along sandy beaches following heavy tidal action or storms. Search the drift lines where lightweight shells accumulate in the upper intertidal zone.