Dwarf White Clam
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Veneridae, Genus: Transennella, Species: Transennella tantilla · Veneridae (Venus Clam family) · Bivalve (two-shelled), whole shell, round to slightly triangular fan shape
Species
Transennella tantilla
Shell Type
Bivalve (two-shelled), whole shell, round to slightly triangular fan shape
Family
Veneridae (Venus Clam family)
Size
Approximately 5mm to 8mm, which is typical for adult specimens of this micro-bivalve species.
Color & Pattern
Solid off-white to chalky white base color with subtle, faint brownish speckles near the umbo and margins. The color appears natural though slightly weathered by beach action.
Rarity
Common, frequently found by beachcombers sifting through fine shell drift.
Habitat
Shallow intertidal and subtidal zones, typically burrowing in fine sand, mudflats, or gravelly substrates.
Geographic Range
Pacific coast of North America, ranging from Alaska down to Southern California.
Description
A diminutive and delicate bivalve featuring a solid, rounded to slightly oval outline with fine, concentric growth lines. The surface is mostly smooth with subtle microscopic sculptural grooves. The umbo is small and slightly prominent, pointing toward the anterior end.
Key Features
Very small size, solid white coloration often with faint brownish spots, and fine concentric ridges on a rounded-triangular shell body.
Collector Value
Low monetary value, but popular among micro-shell collectors and beachcombers who specialize in tiny marine specimens.
Condition Notes
Good condition for a beach-worn micro-shell. Intact single valve with slight fading and minor edge wear.
Interesting Facts
Despite their tiny size, these clams play an active role in nearshore marine food webs and are notable for brooding their young within the mantle cavity.
Ecological Role
Serves as an important food source for shorebirds, small fish, and carnivorous snails. They help process organic detritus in benthic sediment.
Similar Species
Other small venus clams and Macoma species, distinguished primarily by hinge structure and fine sculptural details.
Beach Finding Tips
Look in high-tide shell drift lines, particularly where fine sand and shell grit accumulate. Sifting sand through a fine mesh screen is the most effective method.