Thectophila is a genus of moths in the Cosmopterigidae family, although some sources place it in the Blastodacnidae family. The genus contains only one species, Thectophila acmotypa. It is endemic to New Zealand, where it is only known from the Arthur's Pass. The wingspan is about 12.5 mm. All wings are lanceolate, with acutely pointed apices. The forewings are creamy white, narrowly edged with ochreous, a black streak at the apex terminates in a tuft of black cilia. The remaining cilia are whitish. The adults appear in February and can be found amongst rough herbage on mountainsides.