Common periwinkle, also known as the edible periwinkle
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Littorinidae, Genus: Littorina, Species: Littorina littorea · Littorinidae (Periwinkle family) · Gastropod (snail/univalve), whole shell, spiral shape
Species
Littorina littorea
Shell Type
Gastropod (snail/univalve), whole shell, spiral shape
Family
Littorinidae (Periwinkle family)
Size
Approximately 1 inch in length, which is average for this species. Adults typically range from 0.75 to 1.5 inches.
Color & Pattern
Dull brownish-gray base color with faint, dark spiral banding. The colors appear slightly weathered and natural, with some fading on the upper spire.
Rarity
Very Common, frequently found regularly on rocky beaches and intertidal zones.
Habitat
Intertidal zones, primarily found on rocky shores, salt marshes, and tide pools, clinging to rocks, seaweeds, and pilings. Marine to brackish environment.
Geographic Range
North Atlantic coasts, native to northern Europe and introduced to the northeastern coast of North America.
Description
A sturdy, smooth-textured spiral shell with a pointed spire and a rounded body whorl. The aperture is ovate with a simple outer lip and a solid columella, well-adapted to withstanding heavy wave action.
Key Features
Solid, thick shell with a pointed spire, distinct spiral striations, and a lack of an umbilicus. The outer lip is sharp and untoothed.
Collector Value
Low collectible value due to its abundance, though often collected by beginner beachcombers. Typically worth less than a dollar, common in educational kits.
Condition Notes
Fair condition; intact whole shell with noticeable weathering and minor surface erosion on the spire, typical of beach-worn specimens. Collectibility grade is Good.
Interesting Facts
The common periwinkle is a popular food source in many parts of Europe, often harvested and eaten boiled. It is a hearty herbivore that scrapes algae off rocks using its radula.
Ecological Role
Acts as an important grazing herbivore that controls algal growth on rocky shores. Serves as prey for crabs, shorebirds, and fish. Generally not heavily regulated for collection due to high populations.
Similar Species
Rough periwinkle (Littorina saxatilis) and smooth periwinkle (Littorina obtusata), distinguished by smaller size, broader whorls, or habitat preferences.
Beach Finding Tips
Look along rocky intertidal zones during low tide, particularly clinging to seaweed or hiding in rock crevices.