Shark Eye Moon Snail (also known as Northern Moon Snail or Atlantic Moon Snail)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Euspira, Species: Euspira heros · Naticidae (Moon Snail family) · Gastropod univalve with a globose or spiral shape, whole shell
Species
Euspira heros (formerly Lunatia heros)
Shell Type
Gastropod univalve with a globose or spiral shape, whole shell
Family
Naticidae (Moon Snail family)
Size
Approximately 1.5 to 2 inches in the image, which is medium-sized for this species. Adults typically range from 2 to 4.5 inches in maximum dimension.
Color & Pattern
Smooth, glossy finish featuring warm tan, beige, and brownish tones with a lighter band near the suture. The apex shows darker brown and white whorl patterns. Colors are entirely natural and well-preserved.
Rarity
Common, frequently found by beachcombers along the temperate eastern seaboard of North America.
Habitat
Inhabits sandy intertidal and shallow subtidal zones down to moderate depths. Primarily burrows beneath the sand surface in marine environments.
Geographic Range
Western Atlantic Ocean, ranging from the Gulf of St. Lawrence and Nova Scotia down along the eastern coast of the United States to North Carolina.
Description
A classic globose moon snail shell with a low spire, smooth polished surface, and a rounded body whorl. The texture is porcelain-like and sturdy, designed to withstand shifting sands and wave action.
Key Features
Smooth, rounded globose shape, low spire, large body whorl, and a polished surface lacking prominent ribs or cords, often featuring a simple open umbilicus.
Collector Value
Low to moderate commercial value. While widely collected as beach treasures, they are very common and usually valued more for educational displays or decorative crafts than as high-end rare specimens.
Condition Notes
Good to Fine condition. The shell is intact with glossy natural polish, minimal wear, and no major structural fractures or bore holes, though minor natural growth lines are visible.
Interesting Facts
Moon snails are predatory carnivores that drill circular holes into the shells of bivalves using a specialized radula and acidic secretions to feed on the soft tissue inside. They also create sand collars, which are egg masses cemented together with sand.
Ecological Role
Functions as a top benthic predator controlling bivalve populations, helping to maintain balance in soft-bottom marine ecosystems. Their discarded shells frequently provide homes for hermit crabs.
Similar Species
Neverita duplicata (Shark Eye or Lined Moon Snail), which has a distinct dark callus covering the umbilicus, and Euspira triseriata (Spotted Moon Snail), which is smaller and features rows of brownish spots.
Beach Finding Tips
Look along sandy beaches in the temperate northeastern United States and Canada, especially following winter storms or during extreme low tides when shifting offshore bars are exposed.