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Hydrobia acuta : ウィキペディア英語版 | Hydrobia acuta
''Hydrobia acuta'' is a species of very small (4-6mm.) (Linnaeus, 1758) brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. ==Description== Draparnaud's description reads "Coquille ovale-oblongue , un peu conique, aiguë à son sommet,transparente , lisse, quoique marquée de légères stries lorsqu'on l'observe à la loupe. Dans son naturel elle une couleur verdàtre.La spire a six à sept tours. L'ouverture est ovale et le péristome simple.Fente ombilicale peu prononcée. Opercule mince et lisse. In English "Shell oval-oblong, slightly conical, acute at the top transparent, smooth, albeit marked with light streaks when it is observed under the microscope. In nature it is a greenish colour.The spire has six or seven whorls. The opening is oval and the peristome is simple.Little pronounced umbilical slot.Operculum thin and smooth.
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