Leucosyrinx clionella is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.

(Original description) The large, solid shell is chalky, with a rather thick olivaceous periostracum, and about seven whorls.

The constriction corresponds to the anal fasciole behind which the margin of the whorl has the aspect of a thickened band.

The axial sculpture, beside incremental lines, consists of twelve low, rounded, strong, slightly protractive ribs with subequal interspaces, strongest just in front of the fasciole, and, on the body whorl becoming obsolete on the base.

The body shows a moderately thick, smooth callus extended onto the short, straight columella, which is obliquely attenuated in front, with a wide, short, shallow siphonal canal.