Quahog (specifically a juvenile or small Northern Quahog), also known as Hard Clam or Chowder Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Mercenaria, Species: M. mercenaria · Veneridae (Venus Clams) · Bivalve (single valve); shape is sub-ovate to heart-shaped (cordate) near the umbo
Species
Mercenaria mercenaria (95% confidence based on hinge profile and concentric growth lines)
Shell Type
Bivalve (single valve); shape is sub-ovate to heart-shaped (cordate) near the umbo
Family
Veneridae (Venus Clams)
Size
Estimated 1.5 - 2 inches in width. This falls into the 'Cherrystone' or 'Littleneck' size category for the species, which can reach up to 5 inches as adults.
Color & Pattern
Shows a grayish-white base with distinct, dark concentric growth rings. The interior (though partially obscured) typically displays a characteristic deep purple coloration (wampum) near the posterior margin, which is faintly visible through the shell's translucence.
Rarity
Very Common. These are among the most frequently encountered shells along the Eastern United States shoreline.
Habitat
Coastal marine environments, typically found in intertidal and shallow subtidal zones. They prefer muddy or sandy bottoms where they can burrow just below the surface.
Geographic Range
Commonly found along the Atlantic coast of North America, from the Gulf of St. Lawrence to Florida, and successfully introduced to parts of Europe and the Pacific coast.
Description
A sturdy, thick-walled bivalve shell with numerous fine, concentric growth lines. The valves are equal in size (when paired) and possess a prominent, forward-curving beak (umbo).
Key Features
Distinguished by the heavy weight of the shell for its size, the dark purple staining on the interior margin, and the well-defined concentric ridges that become more crowded at the edges.
Collector Value
Low monetary value ($0-$2 USD) due to its abundance, though highly prized by casual beachcombers for the purple fragments utilized in jewelry making.
Condition Notes
The specimen appears to be a beach-worn single valve. The edges show some rounding from wave action, and the surface has slight erosion. Overall collectibility: Good (standard beach specimen).
Interesting Facts
The purple part of this shell was used by Native American tribes (such as the Wampanoag) to create 'Wampum' beads, which served as a form of currency and ceremonial gift. The age of the clam can be determined by counting the thicker growth rings, much like a tree.
Ecological Role
Vital filter feeders that improve water quality by removing suspended particles. They are a major food source for sea stars, whelks, crabs, and humans.
Similar Species
Mercenaria campechiensis (Southern Quahog), which is usually larger, lacks the deep purple interior stain, and has heavier ridges.
Beach Finding Tips
Look for these in the 'wrack line' after a low tide or near salt marshes. Areas with heavy mud/sand composition and tidal flats are the most productive.