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Gastropod

Marsh periwinkle

Littoraria irrorata

Sheltered tidal salt marshes, often on cordgrass and needlerush stems

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Marsh periwinkle

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.

WHERE HAS IT BEEN RECORDED?

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These dated records show past presence. They do not establish today’s abundance, guarantee a sighting, or describe the species’ entire range.

Chesapeake Bay

Recorded here

668 OBIS records in the regional query · snapshot 2026-09-12.

Individual records in this sample do not supply habitat or depth. Use the species reference above for biological context.

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View example source records
  • OBIS · 2024-06-03iNaturalist research-grade observations · Wayne Longbottom · https://creativecommons.org/licenses/by-nc/4.0/
  • OBIS · 2024-04-29iNaturalist research-grade observations · cheshiremoon · https://creativecommons.org/licenses/by-nc/4.0/
  • OBIS · 2024-03-26iNaturalist research-grade observations · aodon · https://creativecommons.org/licenses/by-nc/4.0/