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Tropical Periwinkle
平軸螺
Planaxis sulcatus
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Has a dark shell with white spots in a spiral shape.
可以很容易地通過其黑色外殼和螺旋狀分佈的白色斑點來識別
When in low tide, tropical periwinkle often takes shelter in cluster in damp crevices and rock bottom.
退潮時常常成群結隊躲在潮濕的裂縫和岩石底
Grazer which feeds on the algae which grows on rock surfaces.
牠是一種刮食者，以生長在岩石表面的藻類為食
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