Marsh Periwinkle

Littoraria irrorata

The Marsh Periwinkle is a small snail that loves to live in wet, salty places like marshes. It has a pretty spiral shell that can be different colors, making it a fun find on the beach!

Habitat: Coastal areas

Appearance

The Marsh Periwinkle has a sturdy, cone-shaped shell, typically greenish-brown or gray, often adorned with dark spiral bands or flecks. Its aperture is oval, and it stands out from other marsh snails due to its robust shell and characteristic markings, helping it blend into its reedy habitat.

KingdomAnimaliaPhylumMolluscaClassGastropodaOrderLittorinimorphaFamilyLittorinidaeGenusLittoraria

Marsh Periwinkle

Interesting facts

If a Marsh Periwinkle loses its footing, it can quickly reattach itself using a special gooey 'anchor'!

Marsh Periwinkles can live for years, slowly exploring their marshy homes one slime trail at a time!

Marsh Periwinkles sometimes 'surf' on floating debris during floods to find new feeding grounds!

These amazing snails spend most of their lives *above* the water, not in it, unlike most snails!

Special abilities

Marsh Periwinkle can climb high on marsh grasses to escape rising tides and predators, using its strong foot to cling securely.

Marsh Periwinkle has a modified gill cavity (pallial lung) that helps them breathe air and survive long periods out of water.

Marsh Periwinkle can create a mucous trail to grip and climb vertical plant stems, helping them avoid aquatic dangers.

Marsh Periwinkle has a radula, a ribbon of tiny teeth, that helps them scrape algae and diatoms from surfaces for food.

Measurements & details

Size: 20-30 mm
Lifespan: 730-1095 days
Leg Count: 1

Diet & Feeding

They munch on tiny plants and algae, keeping marsh surfaces clean.

Primary Foods

algae
diatoms
fungi
detritus
cordgrass

Foraging Method

Foraging

Ecological connections

eats

Saltmarsh cordgrass

Spartina alterniflora

Grazes on surface detritus and fungi growing on its stems.

eaten by

Fiddler crab

Uca pugilator

Predatory crabs may feed on snails that fall into the water.

eaten by

Mummichog

Fundulus heteroclitus

Small fish eat snails that slip off marsh grass into the water.

eaten by

American Oystercatcher

Haematopus palliatus

Birds with strong bills pry periwinkles from grass stems.

Traits

Solitary

Solitary animals live alone for most of their lives, only interacting with others for mating or parental care.

Colorful

Colorful describes organisms or objects displaying a wide range of bright and distinct colors.

Herbivorous

This trait characterizes organisms whose diet consists entirely or primarily of plant material.

Decomposer

Describes organisms that break down dead organic material, recycling nutrients back into the ecosystem.

Wetland

This habitat trait identifies species found in wetlands, which are areas of land saturated with water, either permanently or seasonally, including marshes, swamps, and bogs.