The Littorinidae are a taxonomic family of over 200 species of sea snails, marine gastropod molluscs in the clade Littorinimorpha, commonly known as periwinkles and found worldwide. In English-speaking countries, gastropod molluscs from other families, such as the Neritidae, are sometimes also commonly known as “winkles” because they are small, round snails that occupy a similar ecological niche.

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Littorinopsis scabra (Mangrove periwinkle)
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Littorinopsis scabra (Mangrove periwinkle)

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Tectarius coronatus (Beaded prickly winkle)
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Tectarius coronatus (Beaded prickly winkle)

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