Rough periwinkles on cobblestones

The stones are washed around when large waves break on the beach. Here, beach crabs are found. Here it is an advantage to have a thick shell.

Rough periwinkle     Other names

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© Aquascope 2000   Tjärnö Marine Biological Laboratory, Strömstad, Sweden
Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson