Northern Moonsnail
ExploreInvertebrate
Northern Moonsnail
euspira heros
The Northern Moonsnail (Euspira heros) is a remarkably large marine gastropod renowned for its active predatory behavior and impressive size. Dwelling beneath the sandy sediments of the western Atlantic, this snail is famous for its immense, muscular foot which it inflates with seawater to plow through sand in search of prey. It is an essential component of coastal marine food webs, keeping bivalve populations in check. Want to find and snap Northern Moonsnail yourself? Get the Snappit app.
Habitat: Found in sandy intertidal and subtidal zones of coastal waters, often burying itself just beneath the surface of the sand.
Appearance
This species possesses a large, smooth, globular shell that can reach up to 14 centimeters in diameter. The shell is typically creamy white, pale grey, or light brownish-grey with a highly expanded body whorl and a short spire. When active, the snail extends a massive, fleshy, translucent-grey foot that can almost completely envelop its shell. It has a tough, leathery, horn-like operculum (trapdoor) used to seal itself safely inside.
KingdomAnimaliaPhylumMolluscaClassGastropodaOrderLittorinimorphaFamilyNaticidaeGenusEuspira
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
The distinctive 'sand collars' found on sandy beaches are actually the egg masses of the Northern Moonsnail, structured out of sand grains glued together with mucus.
To eat a clam, the moonsnail can spend up to several days drilling a single, highly precise hole through the victim's shell.
When threatened, it can squeeze all the water out of its massive foot, shrinking it entirely inside its shell before sealing the opening with its hard trapdoor.
Special abilities
Ability
Acid Boring
Utilizes a specialized accessory boring organ to secrete acid, softening a prey's shell before drilling a perfect circular hole using its radula.
Ability
Hydro-Expansion Foot
Draws seawater into its massive muscular foot, expanding it to several times the shell's volume to glide over sand and smother prey.
Ability
Sand Collar Engineering
Creates a unique, collar-shaped egg mass by cementing thousands of eggs between layers of sand and mucus, which hardens into a protective, flexible ring.
Measurements & details
- Length
- 5-14 cm
- Weight
- 0.1-0.6 kg
- Lifespan
- 5-15 years
- Clutch Size
- 10000+
- Incubation
- 30-50 days
Diet & Feeding
A specialized predator that hunts buried bivalves, drilling through their shells to consume the soft inner tissues.
Primary Foods
- Soft-shell Clam
- Atlantic Surfclam
- Blue Mussel
- Quahog Clam
Foraging Method
- Foraging Ambush Under Sand Grip And Drill Shell By Acid And Radula Scraping
Ecological connections
hunts
Soft-shell Clam
Mya arenaria
The Northern Moonsnail actively preys on this buried bivalve, drilling through its shell.
eaten by
Herring Gull
Larus argentatus
Plucks moonsnails from the sand at low tide and drops them from high altitudes onto hard surfaces to crack open their shells.
mutualism
Acadia Hermit Crab
Pagurus acadianus
Frequently colonizes empty, discarded moonsnail shells for protection and shelter.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Northern Moonsnail?
The easiest way to identify Northern Moonsnail is to use the Snappit nature identifier app.
How long is Northern Moonsnail?
5-14 cm
How much does Northern Moonsnail weigh?
0.1-0.6 kg
How long does Northern Moonsnail live?
5-15 years
What does Northern Moonsnail eat?
A specialized predator that hunts buried bivalves, drilling through their shells to consume the soft inner tissues.
Where is Northern Moonsnail usually found?
Found in sandy intertidal and subtidal zones of coastal waters, often burying itself just beneath the surface of the sand.
How does Northern Moonsnail hunt?
Foraging Ambush Under Sand Grip And Drill Shell By Acid And Radula Scraping
How many eggs does Northern Moonsnail lay?
10000+
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