Shark Eye Moon Snail (also known as Shark's Eye, Atlantic Moon Snail)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon Snail family) · Gastropod, whole shell, globular to slightly depressed spiral shape with a low spire
Species
Neverita duplicata
Shell Type
Gastropod, whole shell, globular to slightly depressed spiral shape with a low spire
Family
Naticidae (Moon Snail family)
Size
Approximately 1 inch in width, which appears to be a smaller or juvenile specimen. Adult Shark Eyes typically range from 2 to 3.5 inches in diameter.
Color & Pattern
Uniform glossy white to pale cream coloration, likely sun-bleached or naturally faded. The surface is smooth with faint growth lines. The characteristic dark brown or purple-brown callus (which typically covers the umbilicus in living specimens) is not visibly prominent or may be absent due to wear.
Rarity
Common; frequently found washed ashore along sandy beaches throughout its natural range.
Habitat
Found in shallow marine waters, primarily in intertidal and subtidal zones down to moderate depths. Prefers sandy bottoms and mudflats where they burrow beneath the sand in search of prey.
Geographic Range
Western Atlantic Ocean, ranging from the coast of Massachusetts down to Florida, the Gulf of Mexico, and parts of the Caribbean.
Description
A smooth, globose marine snail shell featuring a rounded body whorl and a very low, flattened spire. The surface is polished and porcelain-like, though this particular specimen shows signs of beach-wear with a solid white, bleached appearance. The aperture is large and semi-lunar, typical of naticid snails.
Key Features
Globular, low-spired shape; smooth, polished exterior; large rounded body whorl; absence of prominent ornamentation or sculpture apart from subtle growth lines.
Collector Value
Low to Moderate. Because they are very common beach finds, they hold little monetary value for commercial collectors, but they remain popular finds for amateur beachcombers and shell crafters.
Condition Notes
Fair to Good condition. The shell is structurally intact without major fractures, but it is heavily sun-bleached with a solid white color, losing its natural brownish hues. Minor edge wear is visible around the aperture.
Interesting Facts
Moon snails are predatory carnivores that drill circular holes into the shells of bivalves using an acidic secretion and their radula to feed on the soft tissue inside. They are also known for creating distinct sand collars—egg masses composed of sand cemented together with mucus.
Ecological Role
Acts as an important marine predator helping to control populations of bivalves and other benthic mollusks. Their empty shells frequently serve as valuable temporary homes for hermit crabs.
Similar Species
Neverita lewisiana (Lewis's Moon Snail) which is generally larger, and Sinum perspectivum (Baby's Ear Moon Snail) which is flatter and more ear-shaped.
Beach Finding Tips
Look along sandy ocean beaches at low tide, especially after a storm or strong wave action. Search the wrack line where shells accumulate or sift through wet sand near the surf.