Shark Eye Moon Snail (also known as Atlantic Moon Snail)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon Snail family) · Gastropod, whole shell, spiral shape
Species
Neverita duplicata (formerly Polinices duplicatus)
Shell Type
Gastropod, whole shell, spiral shape
Family
Naticidae (Moon Snail family)
Size
Approximately 2 to 2.5 inches in diameter, which is typical for a mid-sized adult specimen. Adults of this species commonly range from 2 to 3.5 inches.
Color & Pattern
Smooth, polished surface featuring shades of warm grayish-brown, tan, and cream, with a distinctive dark chestnut-brown or mahogany-colored apex and inner callus area. The colors appear natural and glossy with fine growth lines.
Rarity
Common
Habitat
Found primarily in shallow subtidal and intertidal zones down to moderate depths, buried beneath sandy or muddy substrates in bays, estuaries, and coastal flats. It is a marine species.
Geographic Range
Western Atlantic Ocean, ranging from Massachusetts down to Florida, the Gulf of Mexico, and parts of the Caribbean.
Description
A classic globular, smooth gastropod shell with a low, flat spire and a large body whorl. The surface is polished and tactile, showing fine growth lines. The prominent dark brown callus partially or completely covers the umbilicus, making it a distinct and handsome addition to any collection.
Key Features
Globular shape with a low spire, smooth polished exterior, and a heavy, dark brown callous pad covering the umbilical area on the base.
Collector Value
Moderately common and affordable, making it a staple piece for beginner and intermediate shell collectors. Valued specimens feature deep, rich colors and unbroken lips.
Condition Notes
Very good to fine condition. The shell is intact with natural gloss and good coloration, showing minor natural growth imperfections but no major cracks or heavy erosion.
Interesting Facts
Moon snails are carnivorous predators that hunt bivalves by drilling a perfectly smooth, countersunk hole through the victim's shell using their radula and acidic secretions before feeding on the soft tissue inside.
Ecological Role
Acts as an important marine predator helping to control bivalve populations in sandy benthic ecosystems. Their egg collars provide food for various small marine scavengers.
Similar Species
Northern Moon Snail (Euspira heros), which is typically larger, lighter in color, and lacks the dark umbilical callus characteristic of the Shark Eye.
Beach Finding Tips
Look along sandy beaches and tidal flats during low tide, particularly after storms or heavy wave action. You can often spot them by looking for characteristic 'sand collars'—the egg masses laid by the snails.