Quahog, Hard Clam, Northern Quahog, Little Neck Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Mercenaria, Species: Mercenaria mercenaria · Veneridae (Venus Clam family) · Bivalve (clam/two-shelled), whole shell, fan/oval shape
Species
Mercenaria mercenaria
Shell Type
Bivalve (clam/two-shelled), whole shell, fan/oval shape
Family
Veneridae (Venus Clam family)
Size
Approximately 2 to 3 inches in width, which is average for this species. Adults typically range from 2 to 4 inches, with some reaching up to 5 inches.
Color & Pattern
Off-white to light gray base color with subtle concentric growth lines. A characteristic deep purple to dark violet patch is prominently visible on the interior margin near the umbo area, typical of this species.
Rarity
Very Common
Habitat
Found in marine and estuarine environments, buried in soft substrates such as sand, mud, or seagrass beds in intertidal to shallow subtidal zones down to about 50 feet.
Geographic Range
Western Atlantic coast from Prince Edward Island in Canada down to Florida and the Gulf of Mexico.
Description
A sturdy, solid bivalve shell with a rounded to oval outline. The exterior features fine, concentric growth lines rather than heavy ribs. The interior exhibits the classic, highly prized deep purple margin that historically inspired Native American wampum beads.
Key Features
Heavy, solid construction, smooth to finely concentrically ribbed exterior, rounded oval shape, and the signature dark purple-violet pigmentation on the interior hinge and margin.
Collector Value
Low to moderate commercial value due to abundance, though specimens with exceptionally deep purple interiors or unusual sizes are appreciated by regional collectors. Commonly found in shell shops and seafood markets.
Condition Notes
Good condition, intact single valve with natural coloration preserved and minimal wear. Collectibility grade is Good.
Interesting Facts
The scientific genus name 'Mercenaria' comes from the Latin word for wages or coin, referencing how indigenous peoples used the purple parts of the shell as currency known as wampum. They can live for decades.
Ecological Role
Acts as an important benthic filter feeder, helping to clarify coastal waters by consuming phytoplankton and serving as an important prey item for crabs, rays, and marine mammals.
Similar Species
Southern Quahog (Mercenaria campechiensis), which lacks the deep purple interior coloration, and the Pacific Littleneck Clam (Leukoma staminea), which has prominent radial ribbing.
Beach Finding Tips
Look along sandy or muddy estuarine beaches, tidal flats, and storm wrack lines after heavy coastal storms. Single valves are frequently washed ashore.