Lacuna marmorata is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles.

[1] Lacuna marmorata has 6 described color morphs, most of which are variations of brown with white stripes.

Lacuna marmorata can also be distinguished by its more spherical shell with a smaller aperture.

The females of this species can store sperm to produce fertilized eggs without mating.

Sperm retention has been documented to last as long as 60 days.