Smooth periwinkle on a common periwinkle – Acadia, Maine

(Littorina obtusata) on a common periwinkle (Littorina littorea) on rockweed (Fucus sp).

Smooth periwinkle (Littorina obtusata) on a common periwinkle (Littorina littorea) on rockweed (Fucus sp).

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(Littorina obtusata) on a common periwinkle (Littorina littorea) on rockweed (Fucus sp).

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