Lobed Moon Snail (also known as the Shark Eye or Atlantic Moon Snail)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon Snail family) · Gastropod (snail/univalve), whole shell, spiral shape
Species
Neverita duplicata
Shell Type
Gastropod (snail/univalve), whole shell, spiral shape
Family
Naticidae (Moon Snail family)
Size
Approximately 1 to 2 inches in width, which is typical for a young adult or medium-sized specimen. Fully grown adults typically range from 2 to 3.5 inches.
Color & Pattern
Smooth, glossy, porcelain-like white or cream base color featuring distinctive, well-defined reddish-brown rectangular or square spots arranged in spiral rows around the body whorl. The spire shows intricate, wavy brown and cream patterns. Colors are entirely natural and vivid.
Rarity
Common (frequently found washed ashore on sandy beaches after storms or low tides)
Habitat
Found in shallow marine waters, primarily in intertidal and subtidal zones down to moderate depths. Prefers sandy bottoms and mudflats where it burrows just beneath the surface in search of prey.
Geographic Range
Western Atlantic Ocean, ranging from Massachusetts south along the United States coast to Florida, and throughout the Gulf of Mexico.
Description
A classic, beautiful marine snail shell featuring a globose or hemispherical shape with a low spire and a remarkably large, expanded body whorl. The surface is exceptionally smooth and polished to the touch, with no harsh sculptural ridges. The pattern of bold brown blocks against a pristine white background makes it highly attractive.
Key Features
Smooth, glossy texture, globose body whorl, low spire, distinctive square-to-rectangular brown blotches on a white background, and a characteristic closed umbilicus covered by a distinctive callus pad.
Collector Value
Low to Moderate. While very popular among casual beachcombers for their beauty and distinctive pattern, they are common enough that standard specimens hold modest monetary value, usually sold affordably in shell shops.
Condition Notes
Gem to Fine condition. The shell is fully intact with no major chips, cracks, or structural damage. Colors remain vibrant and natural with high gloss, showing minimal to no sun-bleaching or environmental wear.
Interesting Facts
Moon snails are infamous predatory carnivores. They drill clean, countersunk holes into the shells of bivalves using their radula and acidic secretions to consume the soft tissue inside. They are also known for creating 'sand collars'—egg masses composed of sand glued together with mucus.
Ecological Role
Acts as an apex predator among benthic invertebrates, helping to control bivalve populations. Their empty shells frequently serve as essential mobile housing for hermit crabs.
Similar Species
Neverita lewisii (Lewis's Moon Snail) which is generally larger and more uniformly colored without the distinct spotted pattern, and Polinices uberinas which has different proportions and coloration.
Beach Finding Tips
Look along sandy ocean beaches during low tide, particularly after rough weather or storms. Search the wrack line where shells accumulate, or look for slight humps or tracks in wet sand where they have been active.