Clionella rosaria is a species of sea snail, a marine gastropod mollusk in the family Clavatulidae.

The post-nuclear whorls are moderately rounded, constricted at the sinus, which causes the summit of the turns to appear as a cord.

These ribs are interrupted at the sinus a little distance below the summit, and become decidedly enfeebled on the base, vanishing before they reach the columella.

The lirae, between the spiral striations and the axial lines of growth, inclose numerous small pits, giving the entire surface between the sutures the appearance of a grating.

The space between the sinus and the anterior portion of the outer lip forms a claw-like element.