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Rough Periwinkle
Littorina saxatilis

3 dive sites
MS HamburgSvolvær, Norway Lofoten Islands, NorwayBest Jun–Sep · estimated7 mm / dry- Ploum'AquaTrégastel, Côtes-d'Armor, FranceBest Jun–Sep · estimated5 mm
Bigouden Ranniged Ar MorGuilvinec, Finistère, FranceBest Jun–Sep · estimated5 mm
Sources: Species occurrences: OBIS (CC BY 4.0), GBIF.org