Mangelia lutaria Hedley, 1907 Exomilus lutarius is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

(Original description) The small, solid shell is cylindrical and abruptly truncate above.

It contains five whorls, three forming the protoconch, sloping on the shoulder, perpendicular at the side, and concave at the base.

Protoconch : first whorl wound oblique to the axis of the main shell, the second overhanging the third, appearing as if the apex was wrapped in a turban.

The aperture is long, narrow, fortified by a heavy varix, in the anterior angle of which is excavated a deep sinus.