Styloptygma jaculum is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

[2] The white sharp-pointed shell has a length of 8 mm.

The teleoconch contains 11 straight and smooth whorls.

The outer lip is simple; The columella is once plaited.

[3] This species occurs in the Pacific Ocean off the Loyalty Islands.