Andesiana is a genus representing its own family Andesianidae and superfamily Andesianoidea, the "Andean endemic moths". It contains three species with a wingspan up to 5.4 cm. in female A. similis and 3.5 cm. in males. This far surpasses in size any previously known monotrysian moth. These large Microlepidoptera are restricted to Andean South America, from where they were described originally in 1989 in the family Cossidae by their discoverer Patricia Gentili.