Lettered Olive (also known as the Common Olive)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Olividae, Genus: Americoliva, Species: Americoliva sayana · Olividae (Olive family) · Gastropod, whole shell, cylindrical or bullet-shaped spiral
Species
Americoliva sayana
Shell Type
Gastropod, whole shell, cylindrical or bullet-shaped spiral
Family
Olividae (Olive family)
Size
Approximately 0.75 inches, which is small for this species. Adults typically range from 1.5 to 2.5 inches in length.
Color & Pattern
Glossy porcelain-like finish featuring distinct zig-zag or tent-like markings in shades of brown and tan arranged in spiral bands over a creamy white or pale yellowish-orange base color. The colors are natural and well-preserved with a shiny exterior glaze.
Rarity
Common
Habitat
Shallow subtidal and intertidal zones, typically buried just beneath the surface of clean fine-sand flats, sandbars, and near-shore coastal waters.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina down through Florida, the Gulf of Mexico, and the Caribbean to Brazil.
Description
A sleek, highly polished, cylindrical shell with a low, pointed spire and a long, narrow aperture running the length of the body whorl. The surface is completely smooth, lacking ribs or heavy sculpture, and gleams naturally due to the animal's mantle covering it during life.
Key Features
Cylindrical bullet shape, smooth and glossy exterior, deep and narrow vertical aperture, and a distinctive zig-zag tent pattern over pale bands.
Collector Value
Low to Moderate value. While very popular among casual beachcombers and beginner collectors due to its beauty and abundance, specimens are generally of low monetary value (under $1 each) unless exceptionally large or exhibiting unusual color morphs.
Condition Notes
Good to Fine condition. The shell is intact with minor wear near the apex tip. Retains much of its original glossy sheen and clear color banding with no major structural fractures.
Interesting Facts
Americoliva sayana is the official state shell of South Carolina. The living snail is carnivorous, using a proboscis to capture prey such as bivalves and other small gastropods beneath the sand.
Ecological Role
Functions as an active benthic predator helping to regulate populations of small invertebrates in sandy marine ecosystems. They are preyed upon by larger fish, crustaceans, and predatory gastropods.
Similar Species
Porphyry Olive (Americoliva porphyria) found in the Pacific, and the Variable Olive (Oliva sayana variants), which can be distinguished by differences in geographic origin, size, and specific tent-pattern arrangements.
Beach Finding Tips
Look along exposed sandy beaches and sandbars at low tide, particularly after storms or heavy wave action. Walking slowly just at the water's edge and scanning for the distinctive cylindrical shape or tracks left in the sand can reveal buried specimens.
Notes
South Carolina