Pyrgocythara helena is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

(Original description) The minute, solid shell is pale yellowish brown.

The four subsequent whorls show a deeply constricted, not appressed suture.

These are angulated at the periphery, with subequal deep interspaces, and which are not continuous up the spire.

[2] This marine species occurs in the Sea of Cortez, Western Mexico and off Costa Rica .