Adaina costarica is a moth of the Pterophoridae family. It is found in Costa Rica. The wingspan is 13–16 mm. The head is scaled and ochreous-white. The antennae are pale ochreous-while. The thorax, tegulae, mesothorax and abdomen are yellow-white. The forewings are yellow-white with brown markings and yellow-white fringes. The underside is pale brown. The hindwings are grey-brown with grey fringes. The underside is pale brown. Adults have been recorded in July.