| Janthina janthina
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| Nineteenth-century illustration
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| A live Janthina janthina, with bubble raft, that has been washed up in Maui, Hawaii. This is the normal view from above: the spire of the shell is held pointing down when the animal is floating on the surface of the ocean.
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| Scientific classification
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| Kingdom:
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Animalia
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| Phylum:
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Mollusca
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| Class:
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Gastropoda
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| Subclass:
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Caenogastropoda
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| Order:
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incertae sedis
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| Superfamily:
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Epitonioidea
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| Family:
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Epitoniidae
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| Genus:
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Janthina
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| Species:
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J. janthina
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| Binomial name
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Janthina janthina
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| Synonyms
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- Helix janthina Linnaeus, 1758
- Janthina affinis Reeve, 1858
- Janthina africana Reeve, 1858
- Janthina alba Anton, 1838
- Janthina balteata Reeve, 1858
- Janthina bicolor Menke, 1828
- Janthina bicolor var. major Monterosato, 1878
- Janthina bicolor var. minor Monterosato, 1878
- Janthina britannica Forbes & Hanley, 1853
- Janthina carpenteri Mørch, 1860
- Janthina carpenteri var. contorta Tryon, 1887
- Janthina casta Reeve, 1858
- Janthina coeruleata Reeve, 1858
- Janthina communis Lamarck, 1799
- Janthina costae Mørch, 1860
- Janthina depressa Reeve, 1858
- Janthina fibula Reeve, 1858
- Janthina fragilis Lamarck, 1799 (junior synonym)
- Janthina fragilis var. spiraelata Mørch, 1860
- Janthina grandis Reeve, 1858
- Janthina involuta Reeve, 1858
- Janthina orbignyi Mørch, 1860
- Janthina penicephela Peron, 1824
- Janthina planispirata Adams & Reeve, 1848
- Janthina roseala Reeve, 1858
- Janthina rotundata Dillwyn, 1840
- Janthina smithiae Reeve, 1858
- Janthina striulata Carpenter, 1857
- Janthina striulata var. contorta Carpenter, 1857
- Janthina trochoidea Reeve, 1858
- Janthina violacea Bolten, 1798
- Janthina vulgaris Gray, 1847
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Janthina janthina is a species of holoplanktonic sea snail, a marine gastropod mollusk in the family Epitoniidae. Its common names include violet sea-snail, common violet snail, large violet snail and purple storm snail.