Fluxinella membranacea
Fluxinella membranacea is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.
Description
The size of the shell varies between 2.5 mm and 3.4 mm.Its shell has "a smooth spire, flattened summit, persistent shoulder angulation, and distinctly overhung umbilical wall."