Shark's Eye, also commonly known as the Atlantic Moon Snail or Northern Moon Snail
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Euspira, Species: Euspira heros · Naticidae (Moon snail family) · Gastropod (snail/univalve), whole shell, globular or oval spiral shape
Species
Euspira heros (formerly Lunatia heros)
Shell Type
Gastropod (snail/univalve), whole shell, globular or oval spiral shape
Family
Naticidae (Moon snail family)
Size
Approximately 1 inch in length, which is smaller than average due to being a juvenile specimen. Adult individuals typically range from 2 to 4 inches.
Color & Pattern
Smooth, polished porcelain-like exterior displaying a creamy white base overlaid with warm tan or brownish patches, and distinctive fine brown speckling or reticulated patterns along the shoulder and sutures. The colors appear natural and glossy, though slightly weathered on the apex.
Rarity
Common, frequently found washed up along sandy beaches after storms or high tides within its geographic range.
Habitat
Subtidal and intertidal zones, buried just beneath the surface of fine sandy bottoms, muddy sand, or soft sediment in shallow marine waters.
Geographic Range
Western Atlantic Ocean, primarily along the eastern coast of North America from the Gulf of St. Lawrence and Nova Scotia down to North Carolina.
Description
A compact, highly polished, globular gastropod shell featuring a low spire and a smooth, rounded body whorl. The surface is glossy and tactile with fine growth lines, culminating in a wide, semi-lunate aperture designed to accommodate the snail's large fleshy foot.
Key Features
Globular shape, low spire, smooth glossy texture, large body whorl, and a characteristic open umbilicus (navel) partially covered by the inner lip.
Collector Value
Low to moderate commercial value. While widely collected by beachcombers and appreciated for their smooth polish, common moon snails are usually traded as inexpensive tourist shells or beginner collection pieces, typically valued under a few dollars unless exceptionally large.
Condition Notes
Good condition. The shell is intact with nice natural gloss and color patterns retained, showing only minor wear on the apex and a tiny natural blemish on the body whorl. Collectibility grade is Good.
Interesting Facts
Moon snails are famous carnivorous predators that drill perfectly round, bevel-edged holes into the shells of bivalves like clams using an acidic secretion and a rasping radula, before injecting digestive enzymes to consume their prey.
Ecological Role
Acts as a key marine predator controlling populations of bivalves and other mollusks. Their empty shells also provide essential mobile housing for hermit crabs along sandy shoreline ecosystems.
Similar Species
Neverita duplicata (Shark Eye/Lettered Moon Snail), which features a distinctive purplish-brown callus plugging the umbilicus, unlike the open umbilicus of Euspira heros.
Beach Finding Tips
Look along sandy ocean beaches at low tide, particularly after rough weather or winter storms. Scrape lightly through exposed sandbars or look for the characteristic 'sand collars' (their egg masses) which indicate moon snails are active nearby.