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Valid name
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Janthina prolongata
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| Synonym | Ianthina decollata n. sp. Carpenter, 1857 |
| Synonym | Ianthina nitens var. atlantica n. var. Mørch, 1860 |
| Synonym | Ianthina globosa n. sp. Swainson, 1823 |
| Synonym | Helix Janthina part Linnaeus, 1764 |
| Synonym | Ianthina nitens var. minor n. var. Monterosato, 1878 |
| Synonym | Ianthina iricolor n. sp. Reev, 1858 |
| Synonym | Ianthina splendens n. sp. Monterosato, 1884 |
| Synonym | Ianthina nitens n. sp. Menke 1828 |
| Synonym | Ianthina elongata n. sp. De Blainville in Maravigna, 1838 |
| Synonym | Ianthina payraudeaui n. sp. Locard, 1900 |
| Synonym | Ianthina nana n. sp. Gray, 1842 |