Purple Dwarf Olive, Miniature Olive Shell
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Olividae, Genus: Olivella, Species: Olivella mutica · Olividae (Olive shells) / Olivellinae (Dwarf olives) · Gastropod (univalve) with a cylindrical, spiral-conic shape
Species
Olivella mutica
Shell Type
Gastropod (univalve) with a cylindrical, spiral-conic shape
Family
Olividae (Olive shells) / Olivellinae (Dwarf olives)
Size
Approximately 8-10mm (0.3-0.4 inches). This is a typical adult size for this species, which generally ranges from 7mm to 15mm.
Color & Pattern
Features a creamy white to translucent base on the body whorl with a distinctively colored spire. The spire displays bands of lavender or greyish-purple. The tip (protoconch) is often a darker purple or reddish-brown. The shell has a naturally high, porcelain-like gloss.
Rarity
Common; frequently found in wash-lines of sandy beaches throughout its range.
Habitat
Shallow marine waters, primarily intertidal and subtidal zones. They prefer sandy substrates where they can burrow just beneath the surface.
Geographic Range
Western Atlantic, ranging from North Carolina south through Florida, the Gulf of Mexico, and the Caribbean to Brazil.
Description
An elegant, small, and highly polished shell with a bullet-shaped profile. The shell is smooth and lacks sculptural ribs or spines, allowing for easy burrowing. The aperture is long and narrow, and the spire is relatively high compared to other olives. The suture is distinct but shallowly channeled.
Key Features
Polished glossy finish; lavender-grey banding on the spire; dark purple/brown apical tip; small size; narrow aperture for its family.
Collector Value
Minimal monetary value ($1-$2), but high aesthetic value for 'micro-shell' collectors. Desirability comes from the vibrant purple tip which is prized for jar displays and jewelry.
Condition Notes
The specimen appears to be in 'Fine' condition. It retains its natural gloss and color, though there is slight calcification or wear on the lower body whorl near the anterior canal. No visible predator bore holes.
Interesting Facts
Dwarf olives are carnivores that hunt tiny invertebrates in the sand. Unlike larger olives, they lack a true operculum. They leave characteristic 'wandering tracks' in wet sand during low tide as they move just below the surface.
Ecological Role
Active predator and scavenger in the sandy infaunal community; serves as a food source for shorebirds and larger crabs. Not currently protected or endangered.
Similar Species
Olivella pusilla (Tiny Dwarf Olive) which is smaller and more slender, and Olivella floralia (Rice Olive) which is usually solid white.
Beach Finding Tips
Best found by sifting through fine shell grit at the high-tide line or looking in shallow tide pools during a retreating tide. They are often overlooked due to their small size.