Stangeia rapae is a moth of the Pterophoridae family. It is found on Rapa Island.^[1]

The wingspan is 13-16 mm. The head is grey with scattered white scales. The thorax is grey, but posteriorly creamy white with three longitudinal pale, clay-coloured lines. The forewing ground colour is grey, dorsally suffused pale brownish. The hindwings are greyish fuscous.^[2]

The larvae feed on Siegesbeckia orientalis. They feed in the inflorescence of their host plant. Pupation takes place on the flower stalks or very small leaves.