Bladder Moon Snail
NameBladder Moon Snail
Scientific NamePolinices didyma
Common NameBladder Moon Snail
FamilyNaticidae
GenusPolinices
Speciesdidyma
Geographic DistributionIndo-Pacific region, including East Asia (Japan, China, Korea), Southeast Asia, Australia, and parts of the Indian Ocean.
Habitatintertidal
Shell Shapeglobose
Average Size (mm)Ranges from 50 mm to 100 mm in diameter, with some specimens reaching up to 120 mm.
Identifying FeaturesGlobose shape, smooth and glossy surface, low spire, large body whorl, and a prominent, deep umbilicus that can be open or partially filled by a funicular callus. The shell lacks strong sculpture, relying on its smooth, streamlined form for burrowing.
Raritycommon
Author CitationRöding, 1798
Description
A medium to large-sized marine gastropod shell, characterized by its globose, somewhat flattened shape and smooth, glossy surface. The shell features a low spire and a very large body whorl. A prominent, deep umbilicus is visible, often partially filled or covered by a callus in live specimens, but appears open in this image. The shell is robust and thick-walled.
