Moon Shell (Necklace Shell)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon Snail family) · Gastropod (univalve) whole shell with a globose, rounded spiral shape
Species
Neverita duplicata
Shell Type
Gastropod (univalve) whole shell with a globose, rounded spiral shape
Family
Naticidae (Moon Snail family)
Size
Approximately 1 to 1.5 inches, which is small to medium for the species. Adults typically range from 1 to 3 inches in diameter.
Color & Pattern
Pale tan to creamy white base with brownish or grayish bands, often showing soft brownish streaks near the umbilicus area. The surface is smooth and glossy, appearing somewhat sun-bleached and worn.
Rarity
Common
Habitat
Found in shallow marine waters, primarily in intertidal and subtidal zones down to moderate depths, burrowing beneath sandy or muddy substrates in bays and protected coastal flats.
Geographic Range
Western Atlantic from Massachusetts down to the Gulf of Mexico, Florida, and parts of the Caribbean.
Description
A smooth, highly polished, globose univalve shell with a low spire and a large body whorl. The surface features faint growth lines but lacks heavy sculpture or ridges. The overall form is compact, rounded, and adapted for effortless movement through sand.
Key Features
Globose, sturdy body whorl with a low spire, smooth glossy texture, and a characteristic large aperture, often exhibiting a distinctive callus filling the umbilicus region in this genus.
Collector Value
Low to moderate commercial value. Very common in shell shops and easily found by beachcombers, making it a staple educational specimen rather than a prized rarity.
Condition Notes
Worn and sun-bleached condition with smoothed edges and minor surface abrasion. Grade is Good for a beach find, lacking major fractures but showing the effects of wave action.
Interesting Facts
Moon snails are formidable predators that drill smooth, countersunk holes into the shells of other bivalves using an acidic secretion and a rasping radula to consume their prey.
Ecological Role
Acts as an active carnivorous predator helping to control bivalve populations in sandy benthic marine ecosystems, while empty shells frequently serve as crucial shelter for hermit crabs.
Similar Species
Natica species and other Naticidae members, which can be distinguished by specific callus formations inside the umbilicus and subtle variations in spiral patterning and spire height.
Beach Finding Tips
Look along sandy ocean beaches and bay shores during low tide, particularly after storms or heavy wave action. Search the wrack line where light shells wash ashore.