Glossy Moon Snail (also known as Shark Eye or Natica)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon snail family) · Gastropod, whole shell, globose or spherical shape
Species
Neverita duplicata
Shell Type
Gastropod, whole shell, globose or spherical shape
Family
Naticidae (Moon snail family)
Size
Approximately 1 inch in diameter, which is on the smaller side; adults of this species typically range from 1.5 to 3 inches.
Color & Pattern
Uniform smooth off-white to creamy pale yellow color, likely sun-bleached. The surface exhibits a porcelain-like gloss with faint, delicate growth lines visible across the body whorl.
Rarity
Common, frequently found by beachcombers along sandy shores within its range.
Habitat
Marine benthic environment, typically found burrowing just beneath the surface in intertidal and shallow subtidal sandy flats and mudflats.
Geographic Range
Western Atlantic Ocean, ranging from the coast of Massachusetts down through the Gulf of Mexico, Caribbean, and South America.
Description
This is a smooth, globular univalve shell with a low spire and a greatly expanded final body whorl. The texture is porcelain-smooth and polished, featuring subtle concentric growth lines. The aperture is wide and semi-lunar, though the underside and umbilicus are not visible in this dorsal view.
Key Features
Globular or button-like rounded shape, low spire, smooth glossy exterior texture, and a lack of prominent sculptural ribs or spines, focusing entirely on a sleek hydrodynamic form.
Collector Value
Low to moderate value. While very popular among casual beachcombers and beginner shell collectors due to their pleasing symmetry and smooth feel, they are too common for high-value commercial trade.
Condition Notes
The shell appears to be in good, intact condition with a smooth exterior finish, though it is uniformly white due to sun-bleaching or natural wear, losing any potential brownish or purple-gray undertones. Grade: Good.
Interesting Facts
Moon snails are formidable carnivorous predators. They drill perfectly smooth, countersunk holes into the shells of other bivalves using their radula and acidic secretions to access and consume the soft tissue inside.
Ecological Role
As apex carnivorous predators among benthic micro-invertebrates, moon snails help regulate bivalve populations. They serve as a vital link in the marine food web, though their predatory habits can impact local clam populations.
Similar Species
Atlantic Moon Snail (Neverita lewisii), which grows significantly larger, and the Shark Eye (Neverita duplicata), which often shows darker coloration near the umbilicus.
Beach Finding Tips
Look along sandy beaches during low tide, particularly after storms or heavy wave action. Examine the wet sand near the surf line or sift through shell drift lines where smaller gastropods accumulate.