Janthinidae
纲名:腹足纲(Gastropoda) 目名:异腹足目(Heterogastropoda) 科名:紫螺科(Janthinidae) 属名:紫螺属(Janthina ) 范围：
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这些色彩斑斓的生物属紫螺科，足部产生的气泡可产生使它们浮在水面的浮力。
The colourful creatures, who are members of the Janthinidae family, stay alive by attaching their feet to the bubbles they carry to give them buoyancy.
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