From Wikipedia, the free encyclopedia
|Live individual of Hydatina physis, head end towards the top of the image|
informal group Lower Heterobranchia
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