Quahog (Hard-shell Clam) Fragment (specifically a 'Mercenaria' shard)
Phylum: Mollusca, Class: Bivalvia, Order: Veneroida, Family: Veneridae, Genus: Mercenaria, Species: M. mercenaria · Veneridae (Venus Clams) · Bivalve (Fragment); Wedge-shaped shard of a heavy-shelled clam.
Species
Mercenaria mercenaria (Confidence: 95%)
Shell Type
Bivalve (Fragment); Wedge-shaped shard of a heavy-shelled clam.
Family
Veneridae (Venus Clams)
Size
Approximately 2-2.5 inches in length. This is a small fragment of a much larger adult clam which could reach 4-5 inches.
Color & Pattern
Mottled coloration featuring chalky white, iron-stained tan, and significant patches of deep purple/blue-black towards the interior edge. The exterior shows heavy weathering and exposure to minerals in the sand.
Rarity
Very Common as a species; the specific purple-tinted fragments are frequently found at Folly Beach.
Habitat
Intertidal to shallow subtidal zones. Lives buried in sandy or muddy substrates in salt marshes, bays, and offshore.
Geographic Range
Western Atlantic coast from Gulf of St. Lawrence to Florida and the Gulf of Mexico. Extremely common in South Carolina waters.
Description
This is a robust, thick-walled fragment from a Northern Quahog. It is a wedge-shaped piece of the shell's edge, showing the high mineral density of the species. The texture is smooth but pitted by beach erosion, with a notable 'blue' or purple inner pigment typical of the genus.
Key Features
Extreme thickness of the shell wall, heavy weight for its size, and the characteristic deep purple coloration on the interior margin near the posterior end.
Collector Value
Low for scientific collections due to being a fragment; however, it has high 'craft value.' These purple shards are often collected by beachcombers to make jewelry or 'Folly Beach sea glass' art.
Condition Notes
Poor (Fragment/Shard). This is a beach-worn piece rather than a whole specimen. It shows significant rounding of the edges from surf action and some sun-bleaching on the exterior.
Interesting Facts
The purple portion of these shells was highly prized by Native Americans (such as the Wampanoag and Narragansett) to create 'Wampum' beads, which served as both jewelry and a medium of exchange/currency.
Ecological Role
Quahogs are vital filter feeders that improve water quality by removing algae and organic matter. They are a primary food source for whelks, rays, and humans.
Similar Species
Mercenaria campechiensis (Southern Quahog), which is usually larger and lacks the deep purple interior staining.
Beach Finding Tips
Look along the tide line at Folly Beach after a storm or strong high tide. These heavy fragments often settle in 'shell pockets' among gravel and heavier debris.
Notes
Folly beach SC