Miamira flavicostata is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[2] This species was described from Japan.

It is reported from Indonesia and eastern Australia.

[3][4] The colouration of this nudibranch is flamboyant, principally with a purple background, orange ridges on the back and yellow spots on the foot.

[5]