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

[2] The subcylindrical, milky-white shell has a pupoidal apex.

The length of the shell measures 4.4 mm.

The sculpture shows prosocline (i.e. they lean forward (adapically) with respect to the direction of the shell) growth lines and microscopic striae.

[1] This species occurs in the Atlantic Ocean off the Cape Verdes at depths between 270 m and 354 m.[1]