Marsh Periwinkle

(Say, 1822)

Littoraria irrorata

Class:

Order:

Family:

Gastropoda

Littorinimorpha

Littorinidae

Littorinidae

Shell Information

Height (mm): 25

Dextral

Chirality:

Conical shell that is taller than it is wide. 8-10 shell whorls with many spiral grooves.

Description:

Ecological Information

Distribution:

Depth (m):

Massachusetts to Texas

0 to 22 meters

Diet:

Herbivore

Habitat:

Marine; Shallow coastal salt marshes and intertidal zones

Misc. Facts

The Marsh Periwinkle can not survive on seagrass alone. One way they supplement their diet is by "farming" fungus. They do this by eating holes in cordgrass and spreading waste on the surface to create the ideal conditions for the fungus to grow.

Citations

MolluscaBase eds. (2021). MolluscaBase. Littoraria irrorata (Say, 1822). Accessed through: World Register of Marine Species at: http://marinespecies.org/aphia.php?p=taxdetails&id=419566 on 2021-06-10

Morris, P. A. (1987). A field guide to shells: Atlantic and Gulf coasts and the West Indies (3rd ed.). Houghton Mifflin.