Amalda rubiginosa is a species of sea snail, a marine gastropod mollusk in the family Ancillariidae.

[2] (Original description) The shell is oblong, with an elongated and acuminated spire that can vary somewhat in proportion relative to the aperture.

The upper part of the body whorl displays a whitish belt, partially obscured by a rusty-colored callosity that extends over the spire.

The upper part of the aperture is somewhat rounded, with the interior being slightly paler than the shell’s exterior.

The dwarf variety of this shell exhibits a beautiful lilac tint across the inner aperture, inner lip, and part of the spire.