Eastern Mudsnail
ExploreInvertebrate
Eastern Mudsnail
ilyanassa obsoleta
The Eastern Mudsnail is a small, ubiquitous marine gastropod that plays an incredibly vital role in coastal ecosystems. Found blanketing mudflats and estuaries, these highly social snails gather in dense herds to scavenge and feed, serving as nature's tiny clean-up crew. Their collective feeding action helps aerate the mud and recycle organic nutrients back into the ecosystem, supporting a wide range of marine life. Though they may seem simple, these resilient snails possess sophisticated chemical sensors that help them navigate their muddy habitats. They are also known for their complex relationship with parasites, acting as hosts to several species of flatworms that eventually infect shorebirds, making them a fascinating subject for ecological study.
Habitat: Found in sheltered intertidal mudflats, estuaries, and salt marshes, often where organic debris is abundant.
Appearance
Measuring up to 3 centimeters in length, the Eastern Mudsnail has a dark brown to nearly black, conical shell adorned with fine spiral lines. The tip or apex of the shell is frequently eroded, revealing a contrasting chalky white or gray underlying layer. When active, the snail extends a soft, grayish-mottled foot and two long, slender tentacles used to probe its surroundings.
KingdomAnimaliaPhylumMolluscaClassGastropodaOrderNeogastropodaFamilyNassariidaeGenusIlyanassa
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
Eastern mudsnails can gather in massive densities, sometimes exceeding 10,000 snails in a single square meter of mud.
Their shells are frequently colonized by other organisms, such as tiny sea anemones or algae, turning them into walking mini-ecosystems.
When the tide rises, they often burrow completely into the mud, reappearing in massive numbers as soon as the water recedes.
Special abilities
Ability
Chemical Alarm System
When injured, the snail releases a chemical alarm pheromone that warns nearby mudsnails, triggering them to burrow rapidly into the sediment for safety.
Ability
Mucus Trail Tracking
It uses specialized chemoreceptors to detect and follow the slimy trails left by other mudsnails, allowing them to gather in large groups for feeding or mating.
Ability
Erosion Tolerance
Despite living in acidic, abrasive mud that wears away the outer protective layer of its shell, the snail maintains a thick, durable inner shell structure.
Measurements & details
- Length
- 1-3 cm
- Weight
- 0.001-0.005 kg
- Lifespan
- 3-10 years
- Clutch Size
- 20-200
- Incubation
- 7-15 days
Diet & Feeding
The Eastern Mudsnail is primarily a scavenger and detritivore, vacuuming up benthic microalgae, organic debris, and decaying animal matter.
Age differences: Juveniles rely heavily on microscopic algae coating the mud, while mature adults consume more diverse animal detritus and decaying organic material.
Primary Foods
- Benthic microalgae
- Organic detritus
- Carrion
- Bacterial biofilms
Foraging Method
- Foraging
Ecological connections
eaten by
Blue Crab
Callinectes sapidus
Preys heavily on mudsnails, cracking open their shells.
parasite
Trematode Flatworm
Gynaecotyla adunca
Uses the mudsnail as an intermediate host in its complex life cycle.
Traits
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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 Eastern Mudsnail?
The easiest way to identify Eastern Mudsnail is to use the Snappit nature identifier app.
How long is Eastern Mudsnail?
1-3 cm
How much does Eastern Mudsnail weigh?
0.001-0.005 kg
How long does Eastern Mudsnail live?
3-10 years
What does Eastern Mudsnail eat?
The Eastern Mudsnail is primarily a scavenger and detritivore, vacuuming up benthic microalgae, organic debris, and decaying animal matter.
Where is Eastern Mudsnail usually found?
Found in sheltered intertidal mudflats, estuaries, and salt marshes, often where organic debris is abundant.
How does Eastern Mudsnail hunt?
Foraging
How many eggs does Eastern Mudsnail lay?
20-200
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