Asperdaphne ula is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

There are on the body whorl about 18, very oblique, curved, narrow, rather obsolete, irregularly arranged riblets parted by wider shallow furrows.

They are ornamented with close-set, round, minute granules, which swell into small prominent tubercles in crossing the riblets.

The protoconch consists of two globose embryonic whorls, of which the first is immersed, but scarcely flattened down on one side.

They are short, broad, of slow increase, with a rather long sloping shoulder and a sharp carinated angle, below which they are cylindrical, with a very slight contraction to the suture.

The body whorl is broadest at the keel, and from this point convexly contracted to the rather short, broadish, conical snout.

On leaving the body it at once retreats to the left, forming in the shoulder a shallow, open, rounded sinus.