Gastropod

Marsh periwinkle

Littoraria irrorata

Sheltered tidal salt marshes, often on cordgrass and needlerush stems

Photo: (c) Tom Field, some rights reserved (CC BY) · CC-BY · Source and license. Displayed as a resized crop. Photograph illustrates the species.

Habitat: Sheltered tidal salt marshes, often on cordgrass and needlerush stems
Habitat zone: Intertidal marsh vegetation, often above the waterline
Viewing activities: Beach / tidepool

What to look for

A pointed, spiraling shell with grooves and small brown flecks.

Wider distribution

Atlantic and Gulf coasts of North America, from Massachusetts to Texas.

When to look

The available records do not establish a reliable local viewing season. Use the map’s month filter to inspect dated observations; it does not predict an encounter.

RECORDED PRESENCE

Where has Marsh periwinkle been recorded?

These destination links use the same area and date cutoff as the map: 40 km circles, except for the four named regional rectangles. Checked 2026-09-19. Counts describe source records, not individual animals or sighting odds.

Chesapeake BayVirginia & Maryland, United StatesRegional rectangle · 668 source records since 2016About this destination →

Sources, search boundaries and limitations