Pleurotoma niponica E. A. Smith, 1879 (original combination) Microdrillia niponica is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.

The nucleus consists of 1½ rather large, globose, glassy shining whorls.

The four whorls following are strongly keeled around the middle, concave above, with two or three fine spiral lirae, and also concave below the carina, margined at the upper and lower boundaries by a fine thread-like lira arcuately or flexuously elevately striated above the carina, and obliquely but in an opposite direction, beneath it.

The body whorl is encircled beneath the principal keel by about ten lirae, whereof the uppermost is the stoutest, the rest gradually becoming finer towards the base.

The aperture is small, brownish, occupying about three-sevenths of the entire length of the shell.