Nucella heyseana
NameNucella heyseana
Scientific NameNucella heyseana
Common NameNone widely established, sometimes referred to as Heyse's rock snail or whelk
FamilyMuricidae
GenusNucella
Speciesheyseana
Geographic DistributionNorthwest Pacific, including Japan, Korea, and parts of Russia (e.g., Sakhalin, Kuril Islands).
Habitatintertidal
Shell Shapeconical
Average Size (mm)Typically up to 30-40 mm in height.
Identifying FeaturesRobust, thick shell; relatively wide aperture; dark, chitinous operculum; predatory feeding habits; and the distinctive pale, oval egg capsules often laid in clusters, as seen in the image.
Raritycommon
Author Citation(Dunker, 1882)
Description
A marine gastropod, Nucella heyseana, commonly known as a rock snail or whelk, is depicted on a rocky substrate. The main individual is partially withdrawn into its shell, revealing its dark operculum and a cluster of pale, cream-colored egg capsules within the aperture, suggesting brooding behavior. A smaller, juvenile snail or another species is perched on top of the larger shell. The shell itself is robust and dark-colored, blending with the surrounding environment.
