Teldenia illunata is a moth in the Drepanidae family. It was described by Warren in 1907. It is found in New Guinea. The length of the forewings is 13-15 mm for males and 13-15.5 mm for females. The forewings are white, but the costa is buff. There is a double lunulate postmedial, a single lunulate subterminal and dotted terminal fasciae which are buff or brown and often very faint. The hindwings are as the forewings, but the costa is white.