Shark Eye Moon Snail (also known as Common 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 1.5 inches in diameter, which is typical for a juvenile or small adult specimen. Fully grown adults of this species commonly reach 2 to 3 inches.
Color & Pattern
Pale grayish-tan to light brown background with faint, darker brownish growth lines and a distinctive dark purple-brown callus filling the umbilicus area (though obscured in this view). The surface has a smooth, glossy texture with natural wear.
Rarity
Commonly found washed ashore on sandy beaches throughout its geographic range, making it a very common beach find.
Habitat
Inhabits sandy intertidal and shallow subtidal zones, burrowing just beneath the surface of sand flats, mudflats, and shallow coastal waters. It is a marine species.
Geographic Range
Western Atlantic Ocean, ranging from Massachusetts down through the Gulf of Mexico, Florida, and parts of the Caribbean.
Description
A compact, globular, and smooth univalve shell with a low spire and a large body whorl. The shell possesses a sturdy structure designed for burrowing through sandy substrates, featuring a polished finish and rounded contours with subtle growth lines.
Key Features
Globular, spherical shape with a very low spire, smooth porcelain-like exterior, and a wide body whorl. When viewed from the base, the distinct closed or partially covered umbilicus with a dark callus is diagnostic for this species.
Collector Value
Low to moderate commercial value. While extremely popular and nostalgic for beachcombers and casual collectors, they are too common to command high prices among serious conchologists, typically valued at a few dollars.
Condition Notes
The shell appears to be in good, intact condition with minor natural weathering. The surface maintains some of its original polish and color. Grade: Good to Fine collector condition.
Interesting Facts
Moon snails are famous carnivorous predators that drill perfectly smooth, countersunk circular holes into the shells of other bivalves using a combination of acidic secretions and their radula to access the meat inside.
Ecological Role
Acts as an important carnivorous predator in benthic marine ecosystems, helping to regulate populations of clams and other bivalves. They serve as prey for various marine predators and shorebirds.
Similar Species
Neverita lewisii (Lewis's Moon Snail) which is much larger and found on the Pacific coast, and Euspira heros (Northern Moon Snail) which has a more elevated spire and lighter-colored umbilicus.
Beach Finding Tips
Look along sandy ocean-facing beaches, especially at low tide or after a storm. Scan the wrack line where light shells wash up, or look for disturbed sand tracks where the living snail has recently crawled.