Pacific Littleneck Clam (also known as the Common Littleneck, Rock Cockle, or Native Littleneck)
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Protothaca, Species: Protothaca staminea · Veneridae (Venus Clam family) · Bivalve (two-shelled clam), whole shell, ovate to rounded triangular shape
Species
Protothaca staminea
Shell Type
Bivalve (two-shelled clam), whole shell, ovate to rounded triangular shape
Family
Veneridae (Venus Clam family)
Size
Approximately 1.5 to 2 inches in width, which is a common, medium size for this species. Adults typically range from 1.5 to 3 inches.
Color & Pattern
Exterior features a creamy or grayish-white base overlaid with concentric ridges and darker brownish-gray or purplish bands and radial rays. The colors appear natural and slightly weathered. The interior is porcelain-white with a purplish tinge near the posterior margin.
Rarity
Common, frequently found along beaches and rocky intertidal areas within its natural range.
Habitat
Inhabits marine environments, typically found in intertidal and shallow subtidal zones down to about 30 feet. Prefers protected bays, estuaries, and gravelly or mixed sand-mud substrates where it burrows just beneath the surface.
Geographic Range
Northeastern Pacific Ocean, ranging from the Aleutian Islands in Alaska down to San Quintin in Baja California, Mexico.
Description
A sturdy, robust bivalve with a rounded to oval-quadrate outline. The exterior surface is heavily ornamented with a prominent grid-like pattern formed by strong, closely spaced concentric growth ridges intersecting with fine radial ribs. The umbo (beak) points forward, and the margin is finely crenulated.
Key Features
Distinguished by its distinct cross-hatched sculpture resulting from prominent concentric ridges crossing fine radial ribs, a lack of deep lunule/escutcheon contrasts compared to some other venus clams, and a finely toothed inner margin.
Collector Value
Low to moderate commercial value as a collector piece, primarily gathered as a memento by beachcombers or harvested for consumption. Specimens with exceptional size or unique color morphs may be prized by local shell enthusiasts. Value ranges from a few cents to a couple of dollars.
Condition Notes
Good condition with natural weathering. The concentric sculptural ribs are well-preserved, though minor wear is visible on the umbo. Coloration remains intact. Collectibility grade: Good.
Interesting Facts
The Pacific Littleneck is an important commercial and recreational harvest species in the Pacific Northwest and Alaska. They are filter feeders and play an important role in local food webs. Native peoples historically utilized them extensively for food and used their shells for beads and tools.
Ecological Role
As filter feeders, they help clean coastal waters by consuming phytoplankton and suspended organic matter. They serve as an important food source for sea otters, diving ducks, crabs, fish, and shorebirds. Populations are sustainably managed through recreational and commercial fishing regulations.
Similar Species
Manila Clam (Venerupis philippinarum), which has a more elongated oval shape and more prominent posterior slope; and the Butter Clam (Saxidomus gigantea), which lacks the strong radial ribbing and has smoother concentric growth lines.
Beach Finding Tips
Look in protected gravelly beaches, mudflats, and rocky intertidal zones during extreme low tides. Look for small paired siphon holes or slight depressions in the substrate where they burrow just a few inches deep.