Orthenches prasinodes is a moth of the family Plutellidae. It was first described by Edward Meyrick in 1885. This species is endemic to New Zealand and has been observed in both the North and South Islands in the Wellington, Canterbury and Southland regions. It inhabits native forest. The larval host are species in the genus Muehlenbeckia and larvae have been raised on Muehlenbeckia complexia. Adults are on the wing from December until March.

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