Periwinkle (mollusc)

Periwinkles (Littorina littorea) have a visceral mass, radula, foot, and a distinct head.

Taxonomy:

• Phylum: Mollusca

• Class Gastropoda

• Subclass Prosobranchia

• Order Mesogastropoda

• Family Littorinidae

• Subfamily Littorininae

• Genus Littorina

• Species littorea

Also known as a winkle. Eaten in Britain.