Gyrineum perca is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.

[2][1] Shells of Gyrineum perca can reach a length of 31–100 millimetres (1.2–3.9 in).

[3] These unusual shells are quite flattened, well adapted to laying on a soft substrate, with large flanges close to the outer lips and a blade-like outpouching of the outer shell layer, forming two longitudinal folds (hence the genus name).

Shell surface may be whitish, yellowish or pale brown.

[4][5] Indo-Pacific: widespread from Eastern Africa to Japan.