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

They are small, depressed helicoid, and obliquely one-third immersed in the first of the succeeding turns.

They are marked by three strong spiral longitudinal grooves (striations) between the sutures on the early whorls, while on the later ones the peripheral cord becomes completely exposed in the suture, giving these whorls four spiral cords.

Anteriorly there is no limiting groove to denote the peripheral cord, which is apparent in the suture on the preceding turns, where the periphery passes evenly into a short, well-rounded base, which is marked by exceedingly fine, spiral striations and lines of growth.

[3] The type specimen was found off Port Alfred, South Africa.