Hydatina

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 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
 * synonyms
 * Hydatina amplustre Linnaeus, 1758 accepted as Aplustrum amplustre