Izatha lignyarcha

Izatha lignyarcha is a moth of the family Oecophoridae. It is endemic to New Zealand, where it is known only from higher altitudes on the North Island volcanoes (Mount Taranaki and Mount Ruapehu), except for one specimen from Taupō and one from Masterton.

The wingspan is 24.5–30 mm for males and 24–31 mm for females. Adults have been recorded in November, December, January and February.