Fluxinella membranacea is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

[1][2] 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.

"[3] This marine species occurs off the Philippines and New Caledonia.

This Seguenziidae-related article is a stub.