The Unicorn Prominent Moth has a wingspan of about 1 inch. Like most Prominent moths it has a crest of hairlike scales along the inner margin of the forewing. The forewing is brown and gray. The basal area is tan or pale green with scalloped black lines. There is a white dash near the anal angle. The subterminal line is marked with a large straw-colored patch. There are sharp, black marks in the subterminal area. The hindwing is dirty white shaded with gray on the male and dark gray on the female. These moths hold their wings in a tent position. The larva is bright green in the 2nd and 3rd thoracic segments. The head and the rest of the body is brown. There is a prominent hornlike protuberance on the 1st abdominal segment and a smaller one on the 8th abdominal segment. The caterpillar grows to about 1.25 inches.