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photo © ria tan
Knobbly periwinkle
Nodilittorina sp.
Family Littorinidae

These Knobbly periwinkles (Nodilittorina sp.) are even hardier than their cousins. They are often even tinier (about 1cm or less) than other Periwinkles and have little knobs on their shell. Some may be bleached white, while others are more patterned.

 

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