Shark's Eye or Atlantic Moon Snail
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon snail family) · Gastropod univalve with a globose or hemispherical shape, whole shell but heavily weathered and eroded
Species
Euspira lewisii or Neverita duplicata (likely heavily worn moon snail)
Shell Type
Gastropod univalve with a globose or hemispherical shape, whole shell but heavily weathered and eroded
Family
Naticidae (Moon snail family)
Size
Approximately 1 to 1.5 inches in length. This is smaller to average for adult moon snails, which typically range from 1 to 3 inches depending on the specific species.
Color & Pattern
The natural pattern is largely obscured due to heavy wear, sun-bleaching, and erosion. The remaining surface shows a faded grayish-brown to off-white base color with subtle hints of darker tones near the apex area. The surface appears matte and worn.
Rarity
Very Common as a beach-worn specimen, though finding a pristine, glossy, unbroken specimen with its original operculum requires more searching.
Habitat
Typically found in shallow subtidal and intertidal marine zones, burrowing beneath sandy or muddy substrates in search of bivalve prey. They are strictly marine organisms.
Geographic Range
Common along various temperate and tropical coastlines worldwide, with specific related species found along the Atlantic and Gulf coasts of North America.
Description
This is a compact, rounded univalve shell with a smooth, globular contour characteristic of moon snails. Due to heavy wave action and tumbling, the shell has lost its polish, and portions of the outer shell layer are pitted and eroded. The classic low spire and rounded body whorl are still discernible.
Key Features
Globular, rounded shape, low spire, and lack of prominent sculptural ribs or spines. The overall smooth, egg-like contour is diagnostic of the Naticidae family.
Collector Value
Low collectible value due to the heavy wear and lack of pristine features. These are typically left on the beach by advanced collectors, though beginners often keep them as mementos.
Condition Notes
Poor to Fair condition due to heavy surf wear, surface pitting, and complete loss of original luster and coloration. Collectibility grade is low, suitable mainly as a casual beach find rather than a display specimen.
Interesting Facts
Moon snails are infamous predators that drill perfectly smooth, countersunk holes into the shells of clams and other bivalves using an acidic secretion and their radula to access the soft flesh inside.
Ecological Role
Acts as an active carnivorous predator in soft-bottom marine ecosystems, helping to regulate bivalve populations. They serve as food for various marine predators and fish.
Similar Species
Can be confused with other small marine snails or rolled pebbles. Distinguished by its smooth, globular whorl structure and remnants of a closed umbilicus.
Beach Finding Tips
Look along sandy beaches during low tide, particularly in the wrack line where shells and debris accumulate after storms.