Assiminea japonica
Assiminea japonica is a species of small operculate snail, a marine gastropod mollusc or micromollusc in the family Assimineidae.
Description
The length of the shell attains 7 mm, its diameter 5 mm.The shell is lacks an umbilicus and convexly conical. It is rather solid, striate, and lacks any impressed spiral lines. The color is blackish-olive. It has 4½ rather convex whorls, which are separated by a sufficiently deep suture. The upper whorls are eroded. The body whorl is faintly angulate, and its base is slightly convex. The aperture is moderately oblique and pear-shaped. It is sharp above. The peristome is blunt and straight. The inner lip is thickened and whitish.