Eudonia octophora is a species of moth belonging to the family Crambidae. It was named by Edward Meyrick in 1884. It is endemic to New Zealand and has been observed in both the North and South Islands as well as the Chatham Islands. This species is known to inhabit wetlands and its larval plant host are species within the genus Juncus. Adults are commonly on the wing from October until May and are attracted to light.

...