Keelworm tubes on a mussel shell, barnacles on a shore crab carapace and a small frond of bladderwrack, from our day at North Beach, Bridlington, last month.

https://t.co/1ObklcFnvi

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Seaweed mermaids (Bladderwrack | Pyropia | Macarenia)

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Rockweed (knotted wrack, bladderwrack) on rocks. Guest appearance by periwinkle.

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