Marmaroplegma unicolor is a moth in the Eupterotidae family. It was described by Janse in 1915. It is found in South Africa. The wingspan is about 56 mm. The forewings are chestnut-brown, without any markings, except that the costa near the base and the hairs at the base of the inner margin are more of a clay colour, while the veins are marked by a slightly darker irroration. The hindwings are cinnamon-buff, sparingly irrorated on the terminal area and more thickly on the terminal one-third of the veins with chestnut-brown.