Dillwynella planorbisDillwynella planorbis is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.DescriptionThe genus Dillwynella is a classification of various sea snails that Dillwynella Planorbis belongs to. Being a mollusk, the normal height of the shell attains 3 mm and contains various whirls.DistributionThis marine species occurs off Japan.