# 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! - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 1 - **Habitat:** Coastal areas ![Marsh Periwinkle](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Littoraria_irrorata.jpg&width=800) Photo: Graham D. Schuster, CC BY-SA 3.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Littoraria_irrorata.jpg) ## 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. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Mollusca - **Class:** Gastropoda - **Order:** Littorinimorpha - **Family:** Littorinidae - **Genus:** Littoraria ## 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 - **Tide Rider:** Marsh Periwinkle can climb high on marsh grasses to escape rising tides and predators, using its strong foot to cling securely. - **Air Breather:** Marsh Periwinkle has a modified gill cavity (pallial lung) that helps them breathe air and survive long periods out of water. - **Sticky Climber:** Marsh Periwinkle can create a mucous trail to grip and climb vertical plant stems, helping them avoid aquatic dangers. - **Grazer Glider:** 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](https://www.snappit.app/explore/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](https://www.snappit.app/explore/mummichog) (*Fundulus heteroclitus*) — Small fish eat snails that slip off marsh grass into the water. - **Eaten by:** [American Oystercatcher](https://www.snappit.app/explore/american-oystercatcher) (*Haematopus palliatus*) — Birds with strong bills pry periwinkles from grass stems. ## Traits - [Solitary](https://www.snappit.app/explore/traits/solitary): Solitary animals live alone for most of their lives, only interacting with others for mating or parental care. - [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors. - [Herbivorous](https://www.snappit.app/explore/traits/herbivorous): This trait characterizes organisms whose diet consists entirely or primarily of plant material. - [Decomposer](https://www.snappit.app/explore/traits/decomposer): Describes organisms that break down dead organic material, recycling nutrients back into the ecosystem. - [Wetland](https://www.snappit.app/explore/traits/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. - [Coastal](https://www.snappit.app/explore/traits/coastal): Coastal habitats are dynamic environments located along the interface between land and sea, influenced by tides, waves, and saltwater. - [Diurnal](https://www.snappit.app/explore/traits/diurnal): Diurnal animals are primarily active during daylight hours, typically resting or sleeping at night. ## Collections - [Insects](https://www.snappit.app/explore/collections/insects) ## Safety **Danger:** 1/5 · Very low Always wash your hands after touching snails, and be gentle with them. ## Frequently Asked Questions ### How to identify Marsh Periwinkle? Compare the overall shape, opening, spiral, ribs, hinge and surface sculpture. Beach shells often lose the colors and sharp edges they had on the living animal, so shape does most of the work. Seashell Identifier: upload a photo and compare the visible details. ### How big is Marsh Periwinkle? 20-30 mm ### How long does Marsh Periwinkle live? 730-1095 days ### What does Marsh Periwinkle eat? They munch on tiny plants and algae, keeping marsh surfaces clean. ### Where is Marsh Periwinkle usually found? Coastal areas ### How does Marsh Periwinkle hunt? Foraging ### How many legs does Marsh Periwinkle have? 1 ## Where to spot - [Charleston Historic District](https://www.snappit.app/guides/places/charleston-historic-district) — South Carolina, US · Historic District - [French Quarter](https://www.snappit.app/guides/places/french-quarter) — US · Neighborhood - [St. Mary's City](https://www.snappit.app/guides/places/st-marys-city) — US · Neighborhood - [Janes Island State Park](https://www.snappit.app/guides/places/janes-island-state-park) — Maryland, US · State Park [View all places to see Marsh Periwinkle](https://www.snappit.app/guides/where-to-see/marsh-periwinkle) ## More Invertebrate - [Coral](https://www.snappit.app/explore/coral) - [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*) - [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*) - [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*) --- Source: [Marsh Periwinkle: Facts & Places to See — Snappit](https://www.snappit.app/explore/marsh-periwinkle)