Polystira oxytropis is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.

[1] The horn-colored shell contains several sharp keels and numerous spiral raised lines.

The upper keel is the strongest, angulating the whorls, the surface concave above it.

[2] P. oxytropis is considered an "umbrella species" with considerable diversity as shown by DNA sequence data coupled with conchological studies.

[3] This is an Eastern Pacific species, occurring off Western Mexico, in the Gulf of Panama and the Pacific coast of Colombia.