Cythara pusilla Pease, 1860 (original combination) Eucithara pusilla is a small sea snail, a marine gastropod mollusk in the family Mangeliidae.

[1] The length of the shell attains 4.5 mm.

(Original description) The oval shell has a white color, stained with purplish brown.

The whorls are angulated at the sutures.

[2] This marine species occurs off Hawaii.