Eupusia lauta, common name the gaily mainted mitre, is a species of sea snail, a marine gastropod mollusk, in the family Costellariidae, the ribbed miters.
(Original description) The shell is stoutly ovate and rather solid, with a spire that is obtusely rounded. Its surface is marked by somewhat obsolete longitudinal plicate ribs; the ribs themselves are smooth, while the spaces between them are distinctly impressed with striations. The ribs are orange-red in color, whereas the interstices are dark black, and the middle portion of the whorls is white. The columella bears four folds.
This marine species occurs off Papua New Guinea.