| Hydatina amplustre (Linnaeus, 1758) = Aplustrum fasciatum Schumacher, H.C.F., 1817 = Aplustrum thalassiarchi Adams, A., 1855 = Hydatina pulchella Swainson, W.A., 1840 size: 14 - 30 mm distribution: Marchesi Tuamotu Società type: | cat note:
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| Hydatina exquisita Voskuil, 1995 size: mm 15 distribution: Marchesi type: | cat note:
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| Hydatina physis (Linnaeus, 1758) size: mm 26 distribution: unknown type: | cat note: 0000 CdP B. Salvat and C.Rives
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| Micromelo guamensis Quoy & Gaimard, 1825 size: mm ? distribution: Marchesi type: | cat note:
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