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''Hydatina'' is a genus of sea snails, bubble snails, marine opisthobranch gastropod mollusks in the family Aplustridae. == Species == Species within this genus include: * ''Hydatina albocincta'' Van der Hoeven, 1839 * ''Hydatina amplustre'' Linnaeus, 1758 royal paper bubble, ship’s flag shell, swollen bubble. * * Distribution: tropical Indo-Pacific, Australia, South Africa to Hawaii, Madagascar. * * Length: 1.5–4 cm * * Description: active at night, it lives in shallow water on reefs, with a mix of sand, rock and tuf algae; predator feeding on polychaete worms; smaller and more heavily calcified shell than the other members of this species; shell with horizontal lines, with lightbrown stripes, outlined in black, alternating with translucent white stripes; the animal is too large to fit inside its shell. Empty shells are used by hermit crabs. * ''Hydatina cinctoria'' Perry, 1811 (color variant and synonym of ''Hydatina zonata''). * * Distribution: South Africa * ''Hydatina exquisita'' Voskuil, 1995 * * Distribution: Marquesas Islands * * Length: 21 mm * * Description: very globose, thin shell with black and purplish spiral bands on body whorl and a narrow white band below the suture and at anterior end: anterior end of the columella is directed slightly to the right. * ''Hydatina montilai'' Delsaerdt, 1996 * * Distribution: Philippines. * ''Hydatina physis'' (Linnaeus, 1758) * ''Hydatina velum'' Gmelin, 1791 (probably color variant and synonym of ''Hydatina zonata'') * * Distribution: Indian Ocean, East Africa * * Length: 25–50 mm * ''Hydatina vesicaria'' (Lightfoot, 1786) brown-lined paper bubble * * Distribution: Florida, Mexico, Caribbean. * * Length: 17–45 mm * * Description: lives on the bottom at the depth of 8 m to 64 m; very fragile and delicate shell with fine brown spiral lines * ''Hydatina zonata'' Solander in Lightfoot, 1786 zoned paper bubble 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydatina」の詳細全文を読む スポンサード リンク
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