Shark Eye, also known as Moon Snail or Northern Moon Snail
Phylum Mollusca, Class Gastropoda, Order Littorinimorpha, Family Naticidae, Genus Neverita, Species Neverita duplicata · Naticidae (Moon snail family) · Gastropod (snail/univalve), whole shell, globular or spherical spiral shape
Species
Neverita duplicata
Shell Type
Gastropod (snail/univalve), whole shell, globular or spherical spiral shape
Family
Naticidae (Moon snail family)
Size
Approximately 2 inches in diameter, which is medium for this species. Adults typically range from 1 to 3 inches.
Color & Pattern
Smooth, glossy exterior featuring muted brownish-grey and purplish tones with a distinctive dark, eye-like whorl center (hence the name Shark Eye). Colors appear mostly natural with a polished look.
Rarity
Common, frequently found washed ashore along sandy beaches after storms or high tides.
Habitat
Found in shallow marine waters, intertidal and subtidal zones down to moderate depths, burrowing beneath sandy or muddy substrates in bays and protected coastal areas.
Geographic Range
Western Atlantic coast from Massachusetts down to Florida and the Gulf of Mexico, as well as parts of South America.
Description
A smooth, highly polished, globular shell with a low, flattened spire and a prominent, dark-centered apex that resembles an eye. The body whorl is large and rounded, giving the shell a solid, substantial feel in the hand.
Key Features
Smooth, glossy surface, low spire, globular shape, and the striking dark nucleus at the apex that creates the eye-like appearance, along with a typically covered or partially filled umbilicus depending on the exact species variant.
Collector Value
Low to moderate commercial value; popular with casual beachcombers and beginner shell collectors due to its striking 'eye' marking, but too common for high-end specialist collections.
Condition Notes
Good to Fine condition, intact with good surface luster and no major chips or structural damage, though showing minor natural surface wear.
Interesting Facts
Moon snails are carnivorous predators that drill circular holes into the shells of other bivalves using a combination of acidic secretions and their radula to feed on the soft tissue inside.
Ecological Role
Acts as an important predatory control on bivalve populations in sandy benthic ecosystems, helping maintain balance in intertidal marine communities.
Similar Species
Neverita lewisiana (Lewis's Moon Snail) which is significantly larger, and Euspira heros (Northern Moon Snail) which tends to be taller and lighter in color.
Beach Finding Tips
Look along sandy shorelines during low tide, particularly after strong onshore winds or storms. Often found half-buried in wet sand or washed up near the high tide line.